Franklin County, ID — Planting Guide
June to-do list for Franklin County, Idaho
Here's what deserves your attention in Franklin County, Idaho this month. Everything below is tailored to Zone 6a and timed around your local frost dates.
-
Get basil, cucumber, and peppers in the ground
Your last frost (May 19) has passed. These warm-season crops can handle outdoor soil now.
-
Outdoor sowing time: columbine and echinacea (purple coneflower)
Rake a smooth bed, make a shallow furrow, drop seeds at the spacing on the packet, water gently, walk away.
-
Begin indoor sowing: cucumber, kale, and lettuce
These need a head start before your last frost (May 19). Sow into cells now so you're ready to transplant in a few weeks.
-
Collect lettuce, radish, and anemones at their peak
The more you pick, the more the plant produces. Letting fruit overripen tells the plant it's time to stop.
July prep starts now
- Starting indoors: basil, peppers, and pole beans
- First harvests: basil, carrots, and cucumber
- Fall sowing: carrots, kale, and lettuce
Franklin County is in USDA Zone 6a. The average last spring frost is May 19 and the first fall frost is October 3, giving you a growing season of approximately 137 days.
At an elevation of 7,665 ft, Franklin County receives approximately 18.5 in of rainfall annually. Summer highs average 87°F with winter lows around 18°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 54 days year to year — ranging from April 20 in warm years to June 13 in cold years. The growing season is trending shorter by about 4.56 days per decade. Franklin County scores 28/100 (Challenging) on the Microclimate Index.
🌡️ Zone
6a (-10°F to -5°F min)
❄️ Last Frost
May 19
🍂 First Frost
October 3
📅 Growing Season
137 days
⛰️ Elevation
7,665 ft
🌧️ Annual Rainfall
18.5 in
Monthly Watering Calendar for Franklin County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
What this means for you: Most vegetables want about 1 inch of water per week. Franklin County gets 19" a year — months that hit that 1"/week need zero supplemental watering; months that fall short, the table tells you how much to add. Saves you from drowning roots and from drought-stressing plants into bolting.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.4 in | 6 days | — | None |
| Feb | 1.1 in | 6 days | — | None |
| Mar | 1.5 in | 8 days | — | None |
| Apr | 2 in | 8 days | 2.3 in | High |
| May | 1.9 in | 6 days | 2.4 in | High |
| Jun | 1.3 in | 5 days | 3 in | High |
| Jul | 1.8 in | 6 days | 2.5 in | High |
| Aug | 2 in | 5 days | 2.3 in | High |
| Sep | 1.6 in | 6 days | 2.7 in | High |
| Oct | 1.8 in | 5 days | 2.5 in | High |
| Nov | 1.2 in | 5 days | — | None |
| Dec | 1.1 in | 7 days | — | None |
Annual total: 18.7 in. Water needs vary by crop — tomatoes need ~1.2"/week while herbs like rosemary need only 0.3"/week. Check individual plant pages for crop-specific water budgets that factor in your county's rainfall and soil drainage.
Franklin County Soil Profile
Soil Type
Loam
Soil pH
6.7-7.7
Drainage
Well Drained
Frost Risk Probability
Based on 31 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | Jun 13 | Oct 21 | 130 days |
| Cautious | Jun 3 | Oct 11 | 130 days |
| Average year | May 19 | Oct 3 | 137 days |
| Optimistic | May 6 | Sep 21 | 138 days |
| Aggressive (risky) | Apr 20 | Sep 11 | 144 days |
Not very — frost dates can vary by ±54 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Yes — growing seasons are getting shorter here (about 4.6 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Franklin County has challenging growing conditions. Season extension and careful variety selection are essential.
Local Gardening Help in Franklin County
Free expert help is closer than you think. Your county's cooperative extension office connects you with trained gardeners, soil testing labs, and local programs — all specific to Franklin County's climate and soil.
County Extension Office
Franklin County University of Idaho Extension Extension Office
Phone: 208-885-6681
Visit Extension Office Website →
Extension offices are run by land-grant universities and funded by the USDA. Their advice is free, research-based, and tailored to your county's specific conditions.
Master Gardener Program
Free gardening help from trained volunteers
Master Gardeners are community volunteers who complete 40–60 hours of university horticultural training. They answer gardening questions, diagnose plant problems, and offer workshops — all free.
Many extension offices run a Master Gardener hotline where you can call or email with photos of plant problems for free diagnosis.
Soil Testing
Available through your extension office
Before amending your soil, get it tested. Your extension office offers soil testing (typically $10–$25) that tells you exact pH, nutrient levels, and amendment recommendations specific to what you want to grow.
Services Available in Franklin County
Finding local nurseries & garden centers in Franklin County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Franklin County's soil and climate that big-box stores can't. Plants from local growers are typically hardier because they're already acclimated to your zone.
How to Find Them
Search for "nurseries near Franklin County ID" or "garden center Franklin County" on Google Maps. Also check with your extension office — they often maintain lists of reputable local nurseries and plant sales.
Community gardens & gardening groups
Community gardens are a great way to learn from experienced gardeners in your area, especially if you're limited on space. Search "community garden Franklin County ID" or check your extension office and local parks department. Facebook groups like "Franklin County Gardeners" or "Idaho Gardening" are also excellent for local advice and plant swaps.
What to Plant After Your Harvest
After your first crops finish, use the remaining frost-free days to grow a second round.
Show 6 more succession options
Sunlight & Day Length in Franklin County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
For new gardeners: Day length triggers flowering in many crops. Some need short days (sweet potatoes), some long (most flowers), and some are day-neutral (most modern tomatoes). Franklin County's latitude determines which varieties fit your beds.
Longest Day
15.1 hours
Summer solstice daylight
Shortest Day
8.9 hours
Winter solstice daylight
Peak Sun Hours
11 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 9.2 hr | 5.2 hr | Short day |
| February | 10.4 hr | 5.8 hr | Short day |
| March | 11.7 hr | 7.1 hr | Short day |
| April | 13.2 hr | 7.8 hr | Neutral |
| May | 14.4 hr | 8.8 hr | Long day |
| June | 15.1 hr | 11 hr | Long day |
| July | 14.8 hr | 10.6 hr | Long day |
| August | 13.7 hr | 9.5 hr | Neutral |
| September | 12.3 hr | 8.4 hr | Neutral |
| October | 10.8 hr | 6.7 hr | Short day |
| November | 9.6 hr | 5.6 hr | Short day |
| December | 8.9 hr | 5.1 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Franklin County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Why this matters: Watching soil temperature (not air) is the single biggest upgrade most new gardeners can make. Franklin County's typical curve helps you plan — but a $5 soil thermometer in the bed beats any average.
Plant Warm Crops When
Soil reaches 60°F+
Soil rarely reaches 60°F — use black plastic mulch to warm soil.
Best Month to Compost
Jul
Microbial activity peaks when soil is warm.
Active Composting
2 months
Short season — insulate pile or use indoor vermicomposting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 1°F | 7°F | ❄️ Dormant | ~36 weeks |
| Feb | 1°F | 7°F | ❄️ Dormant | ~36 weeks |
| Mar | 8°F | 12°F | ❄️ Dormant | ~36 weeks |
| Apr | 23°F | 21°F | ❄️ Dormant | ~36 weeks |
| May | 34°F | 30°F | ❄️ Dormant | ~36 weeks |
| Jun | 46°F | 42°F | 🐢 Slow | ~24 weeks |
| Jul | 55°F | 48°F | ♻️ Active | ~14 weeks |
| Aug | 56°F | 48°F | ♻️ Active | ~14 weeks |
| Sep | 49°F | 46°F | 🐢 Slow | ~24 weeks |
| Oct | 36°F | 36°F | ❄️ Dormant | ~36 weeks |
| Nov | 19°F | 25°F | ❄️ Dormant | ~36 weeks |
| Dec | 7°F | 15°F | ❄️ Dormant | ~36 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Franklin County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Why this matters: Warm humid regions cycle through pest generations 3-5x faster than cold dry regions. Franklin County's pest score is your early-warning system: high score means commit to disease-resistant varieties and accept some crop loss to bugs.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Moderate | Jul, Aug |
| Cabbage loopers | Moderate | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
Organic pest management tips
- Maintain healthy soil with regular compost additions to build natural pest resistance
- Practice crop rotation annually to break pest cycles
- Encourage beneficial insects with flowering herbs like dill, fennel, and yarrow
Cover Crops for Franklin County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
Why this matters: Cover crops protect microbial life through winter and summer. Bare soil bakes; covered soil stays cooler, moister, and biologically active. The difference shows up in next year's crops.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 19 | Aug 8 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 31 | Aug 1 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 18 | Aug 1 | ✓ Yes | Living mulch, fixes nitrogen, permanent ground cover |
Summer Cover Crops (1 options) — Fill gaps and suppress weeds between plantings
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Sunflowers | Jun 8 | Sep 19 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (6 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 3 | May 5 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 13 | May 5 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 9 | Apr 28 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 25 | May 5 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 30 | May 5 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 25 | May 5 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Franklin County
Why this matters: Pollinators avoid windy days. Franklin County's 10.2 mph average wind isn't enough to stop bees and butterflies — but plant fruiting crops (tomatoes, peppers, squash) in protected microclimates and you'll see noticeably better fruit set.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 16 mph Summer: 10 mph
Fall: 12 mph Winter: 16 mph
Prevailing wind: W. Windy area — plant a windbreak hedge on the W side of your garden.
Windbreak Benefit
6.8/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
High
Hilly terrain with 2,186 ft of elevation range — cold air pools in low spots. Avoid planting frost-sensitive crops in valleys.
Rainwater Harvesting in Franklin County
How much water you can collect, when to collect it, and what size system you need for your garden.
What this means for you: Rainwater is unchlorinated, unfluoridated, and at ambient temperature — plants actually prefer it. Franklin County's 19" annual rainfall means even a small 50-gallon barrel catches enough for a few weeks of garden watering between storms.
Annual Collection
9,320 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
8 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 1,750 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Apr, May, Jul, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Feb, Nov, Dec
Dry months when you'll rely on stored water — size your storage for this gap.
Rainwater collection tips for your area
- Your county receives approximately 18.7 inches of rain per year
- A 1,000 sq ft roof can collect roughly 9,320 gallons annually
- Rainwater harvesting is fully legal in your state
- In your dry climate, every drop counts — consider a larger cistern system
- Position collection tanks in shade to reduce evaporation and algae growth
Soil & Growing Conditions in Franklin County
Soil Type
Loam
Soil pH 6.7–7.7 · Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 7.5/10
High drought stress. Consistent irrigation is essential — consider drip systems, heavy mulch, and drought-tolerant varieties.
Season Tips
137-day frost-free season
Start warm-season crops indoors and focus on short-season varieties. Cold frames extend your season by 3–4 weeks in fall.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 22-page printable includes your zone's planting calendar, a month-by-month task list, a seed inventory tracker, a harvest log, and succession-planting charts. Built to print, write in, and actually use all season.
Recommended for Your Garden
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
Boost soil fertility and structure with rich, well-aged organic compost.
🥬 Vegetables to Grow in Franklin County
107 vegetables that grow well in Zone 6a with planting dates for Franklin County.
Show all 107 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Apr 14 | May 26 | Jun 2 | — | Aug 25 – Sep 29 | 80–100 |
| Amaranth | Mar 24 | May 26 | Jun 2 | — | Sep 1 – Oct 20 | 90–120 |
| Arugula | Apr 14 | May 5 | May 19 | Jul 25 | Jun 23 – Aug 25 | 30–50 |
| Asparagus | — | — | Jun 2 | — | — | 730–1095 |
| Beets | — | May 5 | — | Jul 25 | Jun 30 – Jul 28 | 50–70 |
| Belgian Endive | Apr 14 | May 5 | May 19 | Jul 25 | Sep 8 – Nov 3 | 110–150 |
| Bitter Melon | Mar 24 | May 26 | Jun 2 | — | Aug 4 – Sep 15 | 60–90 |
| Black Beans | — | May 26 | — | — | Aug 25 – Oct 13 | 90–120 |
| Bok Choy | Apr 14 | May 5 | May 19 | Jul 25 | Jun 30 – Aug 4 | 40–60 |
| Broccoli | Apr 14 | May 5 | May 19 | Jul 25 | Jul 21 – Sep 1 | 60–90 |
| Broccoli Rabe | Apr 14 | May 5 | May 19 | Jul 25 | Jun 30 – Aug 4 | 40–60 |
| Brussels Sprouts | Apr 14 | May 5 | May 19 | Jul 25 | Aug 18 – Oct 13 | 90–130 |
| Butternut Squash | Apr 14 | May 26 | Jun 2 | — | Sep 1 – Oct 6 | 85–110 |
| Cabbage | Apr 14 | May 5 | May 19 | Jul 25 | Jul 21 – Sep 15 | 60–100 |
| Calabash | Mar 24 | May 26 | Jun 2 | — | Aug 25 – Oct 20 | 80–120 |
| Carrots | — | May 5 | — | Jul 25 | Jul 7 – Aug 11 | 60–80 |
| Cauliflower | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Sep 15 | 55–100 |
| Celeriac | Apr 14 | May 5 | May 19 | Jul 25 | Sep 1 – Oct 6 | 100–120 |
| Celery | Apr 14 | May 5 | May 19 | Jul 25 | Aug 11 – Oct 6 | 80–120 |
| Celtuce | Apr 14 | May 5 | May 19 | Jul 25 | Jul 21 – Sep 1 | 60–90 |
| Chard | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Sep 1 | 50–60 |
| Chickpeas | Apr 14 | May 5 | May 19 | Jul 25 | Aug 11 – Sep 22 | 80–110 |
| Chicory | Apr 14 | May 5 | May 19 | Jul 25 | Jul 21 – Sep 1 | 60–85 |
| Chinese Cabbage | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Aug 11 | 50–70 |
| Christmas Lima Beans | Mar 24 | May 26 | Jun 2 | — | Aug 25 – Sep 29 | 80–100 |
| Collard Greens | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Sep 15 | 55–75 |
| Corn | — | May 26 | — | — | Jul 28 – Sep 22 | 60–100 |
| Cowpeas | — | May 26 | — | — | Jul 28 – Sep 8 | 60–90 |
| Cress | Apr 14 | May 5 | May 19 | Jul 25 | Jun 2 – Jun 23 | 14–21 |
| Crookneck Squash | Apr 14 | May 26 | Jun 2 | — | Jul 21 – Aug 18 | 45–60 |
| Crosne | — | May 5 | — | Jul 25 | Oct 6 – Nov 17 | 150–200 |
| Cucumber | Apr 14 | May 26 | Jun 2 | — | Jul 28 – Sep 22 | 50–70 |
| Daikon | — | May 5 | — | Jul 25 | Jun 30 – Jul 28 | 50–70 |
| Delicata Squash | Apr 14 | May 26 | Jun 2 | — | Aug 25 – Sep 29 | 80–100 |
| Edamame | — | May 26 | — | — | Aug 11 – Sep 22 | 75–100 |
| Eggplant | Mar 10 | May 26 | Jun 2 | — | Aug 11 – Oct 13 | 65–85 |
| Endive | Apr 14 | May 5 | May 19 | Jul 25 | Jul 7 – Aug 11 | 45–65 |
| Escarole | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Aug 11 | 50–70 |
| Fava Beans | Apr 14 | May 5 | May 19 | Jul 25 | Aug 4 – Sep 15 | 75–100 |
| Fennel | Mar 24 | May 26 | Jun 2 | — | Aug 4 – Sep 15 | 60–90 |
| Garlic | — | — | — | Aug 22 | Nov 21 – Mar 6 | 90–240 |
| Green Beans | — | May 26 | — | — | Jul 21 – Sep 15 | 50–65 |
| Horseradish | — | — | Jun 2 | — | Oct 6 – Dec 15 | 120–180 |
| Hot Peppers | Mar 10 | May 26 | Jun 2 | — | Aug 11 – Nov 17 | 70–120 |
| Hubbard Squash | Apr 14 | May 26 | Jun 2 | — | Sep 15 – Oct 20 | 100–120 |
| Kabocha | Apr 14 | May 26 | Jun 2 | — | Sep 1 – Sep 29 | 85–100 |
| Kai Lan | Apr 14 | May 5 | May 19 | Jul 25 | Jul 7 – Aug 4 | 45–60 |
| Kale | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Sep 8 | 50–70 |
| Kidney Beans | — | May 26 | — | — | Aug 25 – Sep 29 | 85–110 |
| Kohlrabi | Apr 14 | May 5 | May 19 | Jul 25 | Jul 7 – Aug 11 | 45–65 |
| Komatsuna | Apr 14 | May 5 | May 19 | Jul 25 | Jun 23 – Jul 28 | 35–50 |
| Leeks | Apr 14 | May 5 | May 19 | Jul 25 | Aug 18 – Nov 3 | 90–150 |
| Lentils | Apr 14 | May 5 | May 19 | Jul 25 | Aug 11 – Sep 22 | 80–110 |
| Lettuce | Apr 14 | May 5 | May 19 | Jul 25 | Jun 23 – Sep 1 | 30–60 |
| Lima Beans | — | May 26 | — | — | Jul 28 – Sep 8 | 60–90 |
| Loofah | Mar 24 | May 26 | Jun 2 | — | Sep 15 – Nov 17 | 100–150 |
| Luffa | Mar 24 | May 26 | Jun 2 | — | Sep 1 – Nov 17 | 90–150 |
| Mache | Apr 14 | May 5 | May 19 | Jul 25 | Jun 30 – Aug 4 | 40–60 |
| Melon | Apr 14 | May 26 | Jun 2 | — | Aug 11 – Sep 29 | 70–100 |
| Microgreens | Apr 14 | May 5 | May 19 | Jul 25 | May 26 – Jun 23 | 7–21 |
| Mitsuba | Apr 14 | May 5 | May 12 | Jul 25 | Jul 7 – Sep 1 | 50–70 |
| Mizuna | Apr 14 | May 5 | May 19 | Jul 25 | Jun 23 – Jul 21 | 30–45 |
| Mustard Greens | Apr 14 | May 5 | May 19 | Jul 25 | Jun 23 – Aug 25 | 30–50 |
| Napa Cabbage | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Aug 18 | 55–75 |
| New Zealand Spinach | Mar 24 | May 26 | Jun 2 | — | Jul 28 – Aug 25 | 55–70 |
| Okra | Mar 24 | May 26 | Jun 2 | — | Jul 28 – Sep 22 | 50–65 |
| Onion | Apr 14 | May 5 | May 19 | Jul 25 | Aug 18 – Oct 6 | 90–120 |
| Pac Choi | Apr 14 | May 5 | May 19 | Jul 25 | Jun 30 – Jul 28 | 40–55 |
| Parsnip | — | May 5 | — | Jul 25 | Aug 18 – Sep 29 | 100–130 |
| Patty Pan Squash | Apr 14 | May 26 | Jun 2 | — | Jul 21 – Aug 18 | 45–60 |
| Peas | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Sep 8 | 55–70 |
| Peppers | Mar 10 | May 26 | Jun 2 | — | Aug 4 – Oct 13 | 60–90 |
| Pole Beans | Mar 24 | May 26 | Jun 2 | — | Jul 28 – Sep 22 | 55–70 |
| Potatoes | Mar 24 | May 26 | Jun 2 | — | Aug 11 – Oct 20 | 70–120 |
| Pumpkin | Apr 14 | May 26 | Jun 2 | — | Sep 1 – Oct 20 | 85–120 |
| Purslane | Apr 14 | May 5 | May 19 | Jul 25 | Jun 30 – Aug 4 | 40–60 |
| Radicchio | Apr 14 | May 5 | May 19 | Jul 25 | Jul 21 – Aug 25 | 60–80 |
| Radish | — | May 5 | — | Jul 25 | Jun 2 – Jun 23 | 22–35 |
| Rhubarb | — | — | Jun 9 | — | — | 365–730 |
| Romanesco | Apr 14 | May 5 | May 19 | Jul 25 | Aug 4 – Sep 15 | 75–100 |
| Rutabaga | — | May 5 | — | Jul 25 | Jul 28 – Sep 1 | 80–100 |
| Salsify | — | May 5 | — | Jul 25 | Aug 18 – Sep 29 | 100–130 |
| Savoy Cabbage | Apr 14 | May 5 | May 19 | Jul 25 | Jul 28 – Sep 22 | 70–110 |
| Scallions | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Aug 11 | 50–70 |
| Scarlet Runner Beans | Mar 24 | May 26 | Jun 2 | — | Aug 4 – Sep 8 | 60–80 |
| Shallot | Apr 14 | May 5 | May 19 | Jul 25 | Aug 18 – Oct 6 | 90–120 |
| Shiso | Mar 31 | May 26 | Jun 2 | — | Jul 28 – Sep 22 | 50–70 |
| Snap Peas | Mar 24 | May 26 | Jun 2 | — | Jul 28 – Sep 22 | 55–70 |
| Snow Peas | Apr 14 | May 5 | May 19 | Jul 25 | Jul 14 – Sep 8 | 50–65 |
| Soybeans | — | May 26 | — | — | Aug 18 – Oct 13 | 80–120 |
| Spaghetti Squash | Apr 14 | May 26 | Jun 2 | — | Sep 1 – Sep 29 | 85–100 |
| Spinach | Apr 14 | May 5 | May 19 | Jul 25 | Jun 23 – Aug 25 | 35–50 |
| Squash (Summer) | Apr 14 | May 26 | Jun 2 | — | Jul 21 – Sep 22 | 45–65 |
| Squash (Winter) | Apr 14 | May 26 | Jun 2 | — | Aug 25 – Oct 20 | 80–120 |
| Sunchoke | — | — | Jun 2 | — | Sep 22 – Nov 17 | 110–150 |
| Sweet Corn | — | May 26 | — | — | Jul 28 – Sep 8 | 60–90 |
| Sweet Potatoes | Mar 24 | May 26 | Jun 2 | — | Sep 1 – Oct 20 | 90–120 |
| Tatsoi | Apr 14 | May 5 | May 19 | Jul 25 | Jun 23 – Jul 28 | 35–50 |
| Tomatillo | Mar 24 | May 26 | Jun 2 | — | Aug 4 – Oct 13 | 60–85 |
| Tomatoes | Mar 24 | May 26 | Jun 2 | — | Aug 4 – Oct 13 | 60–85 |
| Turnip | — | May 5 | — | Jul 25 | Jun 16 – Jul 21 | 40–60 |
| Watercress | Apr 14 | May 5 | May 19 | Jul 25 | Jun 30 – Aug 4 | 40–60 |
| Watermelon | Apr 14 | May 26 | Jun 2 | — | Aug 11 – Sep 29 | 70–100 |
| Wax Beans | — | May 26 | — | — | Jul 21 – Sep 15 | 50–65 |
| Winter Melon | Mar 24 | May 26 | Jun 2 | — | Sep 1 – Oct 20 | 90–120 |
| Yard Long Beans | Mar 24 | May 26 | Jun 2 | — | Jul 28 – Sep 8 | 55–80 |
| Zucchini | Apr 14 | May 26 | Jun 2 | — | Jul 21 – Sep 15 | 45–60 |
🍓 Fruits to Grow in Franklin County
27 fruits that grow well in Zone 6a with planting dates for Franklin County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 9 | — | Sep 8 – Dec 22 | 90–180 |
| Aronia | — | — | Jun 9 | — | — | 730–1095 |
| Blackberries | — | — | Jun 9 | — | — | 365–730 |
| Blueberries | — | — | Jun 9 | — | — | 730–1095 |
| Boysenberries | — | — | Jun 9 | — | — | 365–730 |
| Cantaloupe | — | — | Jun 9 | — | Aug 18 – Sep 22 | 70–90 |
| Che Fruit | — | — | Jun 9 | — | — | 1095–1825 |
| Cranberries | — | — | Jun 9 | — | — | 730–1095 |
| Currants | — | — | Jun 9 | — | — | 730–1095 |
| Elderberries | — | — | Jun 9 | — | — | 730–1095 |
| Goji Berries | — | — | Jun 9 | — | — | 730–1095 |
| Gooseberries | — | — | Jun 9 | — | — | 730–1095 |
| Grapes | — | — | Jun 9 | — | — | 730–1095 |
| Ground Cherry | — | — | Jun 9 | — | Aug 18 – Oct 13 | 65–80 |
| Hardy Kiwi | — | — | Jun 9 | — | — | 1095–1825 |
| Haskaps | — | — | Jun 9 | — | — | 730–1095 |
| Honeydew | — | — | Jun 9 | — | Sep 1 – Oct 13 | 80–110 |
| Jostaberry | — | — | Jun 9 | — | — | 730–1095 |
| Lingonberries | — | — | Jun 9 | — | — | 730–1095 |
| Medlar | — | — | Jun 9 | — | — | 1095–1825 |
| Mulberries | — | — | Jun 9 | — | — | 730–1825 |
| Pawpaw | — | — | Jun 9 | — | — | 1095–2555 |
| Persimmon | — | — | Jun 9 | — | — | 1095–2555 |
| Quince | — | — | Jun 9 | — | — | 1095–1825 |
| Raspberries | — | — | Jun 9 | — | — | 365–730 |
| Serviceberries | — | — | Jun 9 | — | — | 730–1095 |
| Strawberries | — | — | Jun 9 | — | Sep 8 – Dec 22 | 90–365 |
🌿 Herbs to Grow in Franklin County
35 herbs that grow well in Zone 6a with planting dates for Franklin County.
Show all 35 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Apr 14 | May 5 | May 12 | Jul 25 | — | 365–730 |
| Anise | Apr 14 | May 5 | May 12 | Jul 25 | Aug 11 – Oct 27 | 90–120 |
| Basil | Mar 31 | May 26 | Jun 2 | — | Jul 28 – Sep 29 | 50–75 |
| Bee Balm | — | — | May 26 | — | Aug 25 – Nov 10 | 90–120 |
| Borage | Apr 14 | May 5 | May 12 | Jul 25 | Jul 7 – Aug 25 | 50–60 |
| Caraway | Apr 14 | May 5 | May 12 | Jul 25 | — | 365–450 |
| Catnip | — | — | May 26 | — | Jul 28 – Sep 29 | 60–80 |
| Chamomile | Apr 14 | May 5 | May 12 | Jul 25 | Jul 14 – Sep 22 | 60–90 |
| Chervil | Apr 14 | May 5 | May 12 | Jul 25 | Jun 23 – Aug 25 | 40–60 |
| Chives | — | — | May 26 | — | Jul 28 – Oct 6 | 60–90 |
| Cilantro | Apr 14 | May 5 | May 12 | Jul 25 | Jun 23 – Aug 25 | 40–60 |
| Comfrey | — | — | May 26 | — | Jul 28 – Oct 6 | 60–90 |
| Cumin | Apr 14 | May 5 | May 12 | Jul 25 | Aug 25 – Oct 27 | 100–120 |
| Dill | Apr 14 | May 5 | May 12 | Jul 25 | Jun 23 – Aug 25 | 40–60 |
| Epazote | Mar 31 | May 26 | Jun 2 | — | Jul 21 – Sep 15 | 45–60 |
| Fennel (herb) | Apr 14 | May 5 | May 12 | Jul 25 | Jul 14 – Sep 22 | 60–90 |
| Feverfew | — | — | May 26 | — | Aug 25 – Nov 10 | 90–120 |
| Garlic Chives | — | — | May 26 | — | Jul 28 – Oct 6 | 60–90 |
| Horehound | — | — | May 26 | — | Aug 11 – Oct 6 | 75–90 |
| Hyssop | — | — | May 26 | — | Aug 4 – Oct 6 | 70–90 |
| Lemon Balm | — | — | May 26 | — | Jul 28 – Sep 15 | 60–70 |
| Lemon Thyme | — | — | May 26 | — | Aug 4 – Oct 6 | 70–90 |
| Lovage | — | — | May 26 | — | Aug 4 – Oct 6 | 70–90 |
| Marjoram | — | — | May 26 | — | Jul 28 – Oct 6 | 60–90 |
| Mint | — | — | May 26 | — | Jul 28 – Oct 6 | 60–90 |
| Oregano | — | — | May 26 | — | Jul 28 – Oct 6 | 60–90 |
| Parsley | Apr 14 | May 5 | May 12 | Jul 25 | Jul 14 – Sep 15 | 60–80 |
| Rue | — | — | May 26 | — | Aug 4 – Oct 6 | 70–90 |
| Sage | — | — | May 26 | — | Aug 11 – Oct 6 | 75–90 |
| Savory | — | — | May 26 | — | Jul 21 – Sep 15 | 50–70 |
| Sorrel | Apr 14 | May 5 | May 12 | Jul 25 | Jun 23 – Aug 25 | 40–60 |
| Tarragon | — | — | May 26 | — | Jul 28 – Oct 6 | 60–90 |
| Thai Basil | Mar 31 | May 26 | Jun 2 | — | Jul 28 – Sep 29 | 50–75 |
| Thyme | — | — | May 26 | — | Aug 4 – Oct 6 | 70–90 |
| Valerian | — | — | May 26 | — | Sep 29 – Dec 8 | 120–180 |
🌸 Flowers to Grow in Franklin County
53 flowers that grow well in Zone 6a with planting dates for Franklin County.
Show all 53 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 31 | May 19 | May 19 | — | Jul 14 – Oct 20 | 60–75 |
| Alliums | — | — | — | Aug 22 | Sep 19 – Oct 17 | 28–42 |
| Anemones | Apr 21 | — | May 19 | — | Jun 23 – Jul 21 | 90–120 |
| Astilbe | Mar 17 | — | May 26 | — | Aug 4 – Oct 13 | 70–100 |
| Bachelor's Button | Apr 7 | Apr 21 | May 19 | Aug 22 | Jul 21 – Oct 6 | 60–90 |
| Begonias | Mar 10 | — | May 26 | — | Aug 4 – Nov 3 | 70–90 |
| Black-eyed Susan | Mar 17 | May 19 | May 26 | — | Aug 11 – Nov 24 | 60–80 |
| Bleeding Hearts | Mar 17 | — | May 26 | — | Jul 21 – Aug 25 | 60–90 |
| Calendula | Apr 7 | Apr 21 | May 19 | — | Jul 7 – Oct 6 | 50–70 |
| California Poppy | — | Apr 21 | — | — | Jun 30 – Aug 11 | 60–90 |
| Celosia | Apr 14 | May 26 | May 26 | — | Jul 28 – Nov 10 | 60–90 |
| Columbine | Mar 17 | Jun 2 | Jun 2 | — | Jul 28 – Sep 1 | 70–100 |
| Coreopsis | Mar 17 | May 26 | May 26 | — | Aug 4 – Nov 24 | 60–80 |
| Cosmos | Apr 21 | May 19 | May 19 | — | Jul 28 – Nov 3 | 60–90 |
| Crocus | — | — | — | Aug 22 | Jul 11 – Aug 1 | 10–20 |
| Daffodils | — | — | — | Aug 22 | Jul 18 – Aug 8 | 20–40 |
| Dahlias | Apr 21 | May 26 | May 26 | — | Aug 11 – Nov 24 | 70–120 |
| Daylily | Mar 17 | — | May 26 | — | Aug 11 – Nov 24 | 60–90 |
| Dianthus | Mar 24 | Apr 21 | May 5 | — | Jun 23 – Sep 22 | 60–80 |
| Echinacea (Purple Coneflower) | Mar 17 | Jun 2 | Jun 2 | — | Aug 25 – Dec 1 | 70–90 |
| Foxglove | Mar 17 | May 26 | May 26 | — | Jul 21 – Aug 25 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 31 | May 26 | May 26 | — | Aug 4 – Dec 8 | 70–100 |
| Geraniums | Mar 10 | — | May 26 | — | Aug 4 – Nov 3 | 70–100 |
| Gladiolus | — | May 19 | May 19 | — | Aug 4 – Nov 17 | 70–100 |
| Hostas | Mar 10 | — | May 26 | — | Aug 11 – Nov 24 | 60–90 |
| Hyacinths | — | — | — | Aug 22 | Aug 8 – Aug 29 | 14–28 |
| Hydrangeas | Mar 10 | — | May 26 | — | Aug 4 – Nov 10 | 90–150 |
| Impatiens | Mar 24 | — | May 26 | — | Aug 4 – Nov 10 | 60–75 |
| Irises | — | Division | May 26 | — | Jul 21 – Aug 18 | 60–100 |
| Larkspur | — | Apr 21 | — | — | Jun 30 – Aug 25 | 60–90 |
| Lavender | Mar 10 | — | Jun 2 | — | Aug 11 – Oct 6 | 90–120 |
| Lilies | — | Division | May 26 | — | Aug 4 – Nov 10 | 70–120 |
| Lobelia | Mar 17 | — | May 5 | — | Jun 30 – Sep 22 | 70–80 |
| Lupine | Mar 17 | May 26 | May 26 | — | Jul 21 – Aug 25 | 75–100 |
| Marigolds | Apr 7 | May 26 | May 26 | — | Jul 21 – Oct 20 | 50–70 |
| Nasturtium | Apr 21 | May 26 | May 26 | — | Jul 21 – Nov 10 | 55–65 |
| Pansy | Mar 10 | — | May 19 | Aug 8 | Jul 14 – Sep 15 | 70–90 |
| Peonies | — | Division | May 26 | — | Jul 28 – Sep 1 | 90–120 |
| Petunia | Mar 24 | — | May 26 | — | Aug 4 – Nov 10 | 70–90 |
| Phlox | Mar 17 | May 26 | May 26 | — | Aug 4 – Oct 27 | 80–110 |
| Portulaca | Apr 14 | May 26 | May 26 | — | Jul 14 – Oct 27 | 50–70 |
| Ranunculus | Apr 7 | — | May 19 | — | Jun 30 – Jul 28 | 90–120 |
| Roses | Mar 10 | — | May 26 | — | Aug 4 – Nov 24 | 90–180 |
| Salvia | Mar 17 | — | May 26 | — | Aug 4 – Nov 10 | 70–90 |
| Sedum (Stonecrop) | Mar 17 | — | May 26 | — | Sep 15 – Dec 1 | 60–90 |
| Snapdragon | Mar 10 | Apr 28 | May 19 | — | Jul 28 – Oct 6 | 70–100 |
| Sunflower | Apr 28 | May 26 | May 26 | — | Aug 18 – Nov 10 | 70–100 |
| Sweet Alyssum | Mar 31 | Apr 28 | May 19 | — | Jun 30 – Sep 8 | 45–60 |
| Sweet Pea | Apr 7 | Apr 14 | May 19 | — | Aug 4 – Oct 13 | 65–85 |
| Tulips | — | — | — | Aug 22 | Aug 1 – Aug 29 | 15–30 |
| Vinca (Annual) | Mar 10 | — | May 26 | — | Aug 4 – Nov 10 | 70–90 |
| Yarrow | Mar 17 | May 19 | May 26 | — | Aug 4 – Nov 24 | 60–90 |
| Zinnia | Apr 21 | May 26 | May 26 | — | Aug 4 – Nov 10 | 60–70 |
Monthly Planting Guide for Franklin County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Franklin County.
Frequently Asked Questions
What planting zone is Franklin County, ID?
Franklin County is in USDA Hardiness Zone 6a. This zone classification determines which perennial plants survive winter and sets the baseline for frost timing across the county.
When is the last frost in Franklin County, ID?
Based on 31 years of NOAA weather station data, the median last spring frost in Franklin County falls around May 19. In 8 out of 10 years, last frost lands between April 20 and June 13 — a 54-day window of variability. Use June 13 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Franklin County, ID?
The median first fall frost in Franklin County arrives around October 3. In cold years it can arrive as early as September 11; in mild years as late as October 21. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Franklin County?
Franklin County has a frost-free growing season of approximately 137 days. Focus on short-season varieties and start warm-season crops indoors 6–8 weeks before last frost. Climate records show the growing season is trending shorter by about 4.56 days per decade.
What is the soil like in Franklin County for gardening?
Franklin County has predominantly Loam soil with a pH range of 6.7–7.7 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Franklin County?
Franklin County has commercial agriculture that includes Potatoes, Hay, Wheat, Dairy, Cattle. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Franklin County a good location for home gardening?
Franklin County scores 28/100 (Challenging) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Gardening here benefits from close attention to frost timing and season extension due to the challenging microclimate factors.
Your Franklin County Garden Planner — Free
A 22-page printable planner built for Franklin County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log