Boise County, ID — Planting Guide
Boise County is in USDA Zone 5b. The average last spring frost is May 18 and the first fall frost is September 27, giving you a growing season of approximately 132 days.
At an elevation of 8,023 ft, Boise County receives approximately 24.3 in of rainfall annually. Summer highs average 86°F with winter lows around 16°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 59 days year to year — ranging from April 18 in warm years to June 16 in cold years. The growing season is trending longer by about 6.27 days per decade. Boise County scores 32/100 (Challenging) on the Microclimate Index.
🌡️ Zone
5b (-15°F to -10°F min)
❄️ Last Frost
May 18
🍂 First Frost
September 27
📅 Growing Season
132 days
⛰️ Elevation
8,023 ft
🌧️ Annual Rainfall
24.3 in
Monthly Watering Calendar
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.8 in | 6 days | — | None |
| Feb | 1.4 in | 5 days | — | None |
| Mar | 2.1 in | 7 days | — | None |
| Apr | 2.4 in | 8 days | 1.9 in | High |
| May | 3 in | 8 days | 1.3 in | Moderate |
| Jun | 1.9 in | 4 days | 2.4 in | High |
| Jul | 1.8 in | 6 days | 2.5 in | High |
| Aug | 2.8 in | 6 days | 1.5 in | Moderate |
| Sep | 1.7 in | 5 days | 2.6 in | High |
| Oct | 2.4 in | 5 days | 1.9 in | High |
| Nov | 1.5 in | 6 days | — | None |
| Dec | 1.5 in | 6 days | — | None |
Annual total: 24.3 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.
Boise 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 16 | Oct 25 | 131 days |
| Cautious | Jun 1 | Oct 9 | 130 days |
| Average year | May 18 | Sep 27 | 132 days |
| Optimistic | May 5 | Sep 10 | 128 days |
| Aggressive (risky) | Apr 18 | Sep 3 | 138 days |
Not very — frost dates can vary by ±59 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 longer here (about 6.3 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Boise County has challenging growing conditions. Season extension and careful variety selection are essential.
Local Gardening Help in Boise 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 Boise County's climate and soil.
County Extension Office
Boise 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 Boise County
Finding local nurseries & garden centers in Boise County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Boise 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 Boise County ID" or "garden center Boise 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 Boise County ID" or check your extension office and local parks department. Facebook groups like "Boise 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
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
15.3 hours
Summer solstice daylight
Shortest Day
8.7 hours
Winter solstice daylight
Peak Sun Hours
10.7 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 | 9.1 hr | 5.2 hr | Short day |
| February | 10.2 hr | 5.7 hr | Short day |
| March | 11.6 hr | 6.9 hr | Short day |
| April | 13.2 hr | 7.5 hr | Neutral |
| May | 14.6 hr | 9 hr | Long day |
| June | 15.3 hr | 10.7 hr | Long day |
| July | 15 hr | 10.3 hr | Long day |
| August | 13.8 hr | 9.6 hr | Neutral |
| September | 12.3 hr | 8.8 hr | Neutral |
| October | 10.7 hr | 7.2 hr | Short day |
| November | 9.4 hr | 5.7 hr | Short day |
| December | 8.7 hr | 4.6 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting Calendar
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
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 | 5°F | ❄️ Dormant | ~36 weeks |
| Feb | -1°F | 4°F | ❄️ Dormant | ~36 weeks |
| Mar | 7°F | 9°F | ❄️ Dormant | ~36 weeks |
| Apr | 20°F | 20°F | ❄️ Dormant | ~36 weeks |
| May | 35°F | 31°F | ❄️ Dormant | ~36 weeks |
| Jun | 46°F | 38°F | 🐢 Slow | ~24 weeks |
| Jul | 50°F | 47°F | ♻️ Active | ~14 weeks |
| Aug | 55°F | 48°F | ♻️ Active | ~14 weeks |
| Sep | 44°F | 43°F | 🐢 Slow | ~24 weeks |
| Oct | 34°F | 34°F | ❄️ Dormant | ~36 weeks |
| Nov | 17°F | 25°F | ❄️ Dormant | ~36 weeks |
| Dec | 6°F | 13°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 Boise County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
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 | Low | Jul, Aug |
| Cabbage loopers | Low | 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 Boise County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 23 | Jul 19 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 20 | Aug 2 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 17 | Jul 19 | ✓ 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 | May 30 | Sep 6 | — | 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 1 | May 4 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 18 | May 4 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 12 | May 4 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 14 | Apr 27 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 8 | Apr 27 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 5 | May 4 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate
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: 14 mph
Prevailing wind: W. Windy area — plant a windbreak hedge on the W side of your garden.
Windbreak Benefit
7/10
Strongly recommended — a windbreak (fence, hedge, or row of tall crops like corn or sunflowers) will significantly improve garden yields.
Frost Pocket Risk
High
Hilly terrain with 1,205 ft of elevation range — cold air pools in low spots. Avoid planting frost-sensitive crops in valleys.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
12,111 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
7 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, Aug, Oct
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 24.3 inches of rain per year
- A 1,000 sq ft roof can collect roughly 12,111 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Feb, Nov, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Boise County
Soil Type
Loam
Soil pH 6.7–7.7 · Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
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
132-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.
Free Garden Planner
Plan your entire garden season — organize planting dates, track what you're growing, and know exactly when to start seeds, transplant, and harvest.
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 Boise County
106 vegetables that grow well in Zone 5b with planting dates for Boise County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 13 | May 25 | Jun 1 | Aug 24 – Sep 28 | 80–100 |
| Amaranth | Mar 23 | May 25 | Jun 1 | Aug 31 – Oct 19 | 90–120 |
| Arugula | Apr 13 | May 4 | May 18 | Jun 22 – Aug 24 | 30–50 |
| Asparagus | — | — | Jun 1 | — | 730–1095 |
| Beets | — | May 4 | — | Jun 29 – Jul 27 | 50–70 |
| Belgian Endive | Apr 13 | May 4 | May 18 | Sep 7 – Nov 2 | 110–150 |
| Bitter Melon | Mar 23 | May 25 | Jun 1 | Aug 3 – Sep 14 | 60–90 |
| Black Beans | — | May 25 | — | Aug 24 – Oct 12 | 90–120 |
| Bok Choy | Apr 13 | May 4 | May 18 | Jun 29 – Aug 3 | 40–60 |
| Broccoli | Apr 13 | May 4 | May 18 | Jul 20 – Aug 31 | 60–90 |
| Broccoli Rabe | Apr 13 | May 4 | May 18 | Jun 29 – Aug 3 | 40–60 |
| Brussels Sprouts | Apr 13 | May 4 | May 18 | Aug 17 – Oct 12 | 90–130 |
| Butternut Squash | Apr 13 | May 25 | Jun 1 | Aug 31 – Oct 5 | 85–110 |
| Cabbage | Apr 13 | May 4 | May 18 | Jul 20 – Sep 14 | 60–100 |
| Calabash | Mar 23 | May 25 | Jun 1 | Aug 24 – Oct 19 | 80–120 |
| Carrots | — | May 4 | — | Jul 6 – Aug 10 | 60–80 |
| Cauliflower | Apr 13 | May 4 | May 18 | Jul 13 – Sep 14 | 55–100 |
| Celeriac | Apr 13 | May 4 | May 18 | Aug 31 – Oct 5 | 100–120 |
| Celery | Apr 13 | May 4 | May 18 | Aug 10 – Oct 5 | 80–120 |
| Celtuce | Apr 13 | May 4 | May 18 | Jul 20 – Aug 31 | 60–90 |
| Chard | Apr 13 | May 4 | May 18 | Jul 13 – Aug 31 | 50–60 |
| Chickpeas | Apr 13 | May 4 | May 18 | Aug 10 – Sep 21 | 80–110 |
| Chicory | Apr 13 | May 4 | May 18 | Jul 20 – Aug 31 | 60–85 |
| Chinese Cabbage | Apr 13 | May 4 | May 18 | Jul 13 – Aug 10 | 50–70 |
| Christmas Lima Beans | Mar 23 | May 25 | Jun 1 | Aug 24 – Sep 28 | 80–100 |
| Collard Greens | Apr 13 | May 4 | May 18 | Jul 13 – Sep 14 | 55–75 |
| Corn | — | May 25 | — | Jul 27 – Sep 21 | 60–100 |
| Cowpeas | — | May 25 | — | Jul 27 – Sep 7 | 60–90 |
| Cress | Apr 13 | May 4 | May 18 | Jun 1 – Jun 22 | 14–21 |
| Crookneck Squash | Apr 13 | May 25 | Jun 1 | Jul 20 – Aug 17 | 45–60 |
| Crosne | — | May 4 | — | Oct 5 – Oct 19 | 150–200 |
| Cucumber | Apr 13 | May 25 | Jun 1 | Jul 27 – Sep 21 | 50–70 |
| Daikon | — | May 4 | — | Jun 29 – Jul 27 | 50–70 |
| Delicata Squash | Apr 13 | May 25 | Jun 1 | Aug 24 – Sep 28 | 80–100 |
| Edamame | — | May 25 | — | Aug 10 – Sep 21 | 75–100 |
| Eggplant | Mar 9 | May 25 | Jun 1 | Aug 10 – Oct 12 | 65–85 |
| Endive | Apr 13 | May 4 | May 18 | Jul 6 – Aug 10 | 45–65 |
| Escarole | Apr 13 | May 4 | May 18 | Jul 13 – Aug 10 | 50–70 |
| Fava Beans | Apr 13 | May 4 | May 18 | Aug 3 – Sep 14 | 75–100 |
| Fennel | Mar 23 | May 25 | Jun 1 | Aug 3 – Sep 14 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 25 | — | Jul 20 – Sep 14 | 50–65 |
| Horseradish | — | — | Jun 1 | Oct 5 – Nov 16 | 120–180 |
| Hot Peppers | Mar 9 | May 25 | Jun 1 | Aug 10 – Nov 16 | 70–120 |
| Hubbard Squash | Apr 13 | May 25 | Jun 1 | Sep 14 – Oct 19 | 100–120 |
| Kabocha | Apr 13 | May 25 | Jun 1 | Aug 31 – Sep 28 | 85–100 |
| Kai Lan | Apr 13 | May 4 | May 18 | Jul 6 – Aug 3 | 45–60 |
| Kale | Apr 13 | May 4 | May 18 | Jul 13 – Sep 7 | 50–70 |
| Kidney Beans | — | May 25 | — | Aug 24 – Sep 28 | 85–110 |
| Kohlrabi | Apr 13 | May 4 | May 18 | Jul 6 – Aug 10 | 45–65 |
| Komatsuna | Apr 13 | May 4 | May 18 | Jun 22 – Jul 27 | 35–50 |
| Leeks | Apr 13 | May 4 | May 18 | Aug 17 – Nov 2 | 90–150 |
| Lentils | Apr 13 | May 4 | May 18 | Aug 10 – Sep 21 | 80–110 |
| Lettuce | Apr 13 | May 4 | May 18 | Jun 22 – Aug 31 | 30–60 |
| Lima Beans | — | May 25 | — | Jul 27 – Sep 7 | 60–90 |
| Mache | Apr 13 | May 4 | May 18 | Jun 29 – Aug 3 | 40–60 |
| Melon | Apr 13 | May 25 | Jun 1 | Aug 10 – Sep 28 | 70–100 |
| Microgreens | Apr 13 | May 4 | May 18 | May 25 – Jun 22 | 7–21 |
| Mitsuba | Apr 13 | May 4 | May 11 | Jul 6 – Aug 31 | 50–70 |
| Mizuna | Apr 13 | May 4 | May 18 | Jun 22 – Jul 20 | 30–45 |
| Mustard Greens | Apr 13 | May 4 | May 18 | Jun 22 – Aug 24 | 30–50 |
| Napa Cabbage | Apr 13 | May 4 | May 18 | Jul 13 – Aug 17 | 55–75 |
| New Zealand Spinach | Mar 23 | May 25 | Jun 1 | Jul 27 – Aug 24 | 55–70 |
| Okra | Mar 23 | May 25 | Jun 1 | Jul 27 – Sep 21 | 50–65 |
| Onion | Apr 13 | May 4 | May 18 | Aug 17 – Oct 5 | 90–120 |
| Pac Choi | Apr 13 | May 4 | May 18 | Jun 29 – Jul 27 | 40–55 |
| Parsnip | — | May 4 | — | Aug 17 – Sep 28 | 100–130 |
| Patty Pan Squash | Apr 13 | May 25 | Jun 1 | Jul 20 – Aug 17 | 45–60 |
| Peas | Apr 13 | May 4 | May 18 | Jul 13 – Sep 7 | 55–70 |
| Peppers | Mar 9 | May 25 | Jun 1 | Aug 3 – Oct 12 | 60–90 |
| Pole Beans | Mar 23 | May 25 | Jun 1 | Jul 27 – Sep 21 | 55–70 |
| Potatoes | Mar 23 | May 25 | Jun 1 | Aug 10 – Oct 19 | 70–120 |
| Pumpkin | Apr 13 | May 25 | Jun 1 | Aug 31 – Oct 19 | 85–120 |
| Purslane | Apr 13 | May 4 | May 18 | Jun 29 – Aug 3 | 40–60 |
| Radicchio | Apr 13 | May 4 | May 18 | Jul 20 – Aug 24 | 60–80 |
| Radish | — | May 4 | — | Jun 1 – Jun 22 | 22–35 |
| Rhubarb | — | — | Jun 8 | — | 365–730 |
| Romanesco | Apr 13 | May 4 | May 18 | Aug 3 – Sep 14 | 75–100 |
| Rutabaga | — | May 4 | — | Jul 27 – Aug 31 | 80–100 |
| Salsify | — | May 4 | — | Aug 17 – Sep 28 | 100–130 |
| Savoy Cabbage | Apr 13 | May 4 | May 18 | Jul 27 – Sep 21 | 70–110 |
| Scallions | Apr 13 | May 4 | May 18 | Jul 13 – Aug 10 | 50–70 |
| Scarlet Runner Beans | Mar 23 | May 25 | Jun 1 | Aug 3 – Sep 7 | 60–80 |
| Shallot | Apr 13 | May 4 | May 18 | Aug 17 – Oct 5 | 90–120 |
| Shiso | Mar 30 | May 25 | Jun 1 | Jul 27 – Sep 21 | 50–70 |
| Snap Peas | Mar 23 | May 25 | Jun 1 | Jul 27 – Sep 21 | 55–70 |
| Snow Peas | Apr 13 | May 4 | May 18 | Jul 13 – Sep 7 | 50–65 |
| Soybeans | — | May 25 | — | Aug 17 – Oct 12 | 80–120 |
| Spaghetti Squash | Apr 13 | May 25 | Jun 1 | Aug 31 – Sep 28 | 85–100 |
| Spinach | Apr 13 | May 4 | May 18 | Jun 22 – Aug 24 | 35–50 |
| Squash (Summer) | Apr 13 | May 25 | Jun 1 | Jul 20 – Sep 21 | 45–65 |
| Squash (Winter) | Apr 13 | May 25 | Jun 1 | Aug 24 – Oct 19 | 80–120 |
| Sunchoke | — | — | Jun 1 | Sep 21 – Nov 16 | 110–150 |
| Sunflower | Mar 23 | May 25 | Jun 1 | Aug 10 – Sep 28 | 70–100 |
| Sweet Corn | — | May 25 | — | Jul 27 – Sep 7 | 60–90 |
| Sweet Potatoes | Mar 23 | May 25 | Jun 1 | Aug 31 – Oct 19 | 90–120 |
| Tatsoi | Apr 13 | May 4 | May 18 | Jun 22 – Jul 27 | 35–50 |
| Tomatillo | Mar 23 | May 25 | Jun 1 | Aug 3 – Oct 12 | 60–85 |
| Tomatoes | Mar 23 | May 25 | Jun 1 | Aug 3 – Oct 12 | 60–85 |
| Turnip | — | May 4 | — | Jun 15 – Jul 20 | 40–60 |
| Watercress | Apr 13 | May 4 | May 18 | Jun 29 – Aug 3 | 40–60 |
| Watermelon | Apr 13 | May 25 | Jun 1 | Aug 10 – Sep 28 | 70–100 |
| Wax Beans | — | May 25 | — | Jul 20 – Sep 14 | 50–65 |
| Winter Melon | Mar 23 | May 25 | Jun 1 | Aug 31 – Oct 19 | 90–120 |
| Yard Long Beans | Mar 23 | May 25 | Jun 1 | Jul 27 – Sep 7 | 55–80 |
| Zucchini | Apr 13 | May 25 | Jun 1 | Jul 20 – Sep 14 | 45–60 |
🍓 Fruits to Grow in Boise County
27 fruits that grow well in Zone 5b with planting dates for Boise County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 8 | Sep 7 – Nov 23 | 90–180 |
| Aronia | — | — | Jun 8 | — | 730–1095 |
| Blackberries | — | — | Jun 8 | — | 365–730 |
| Blueberries | — | — | Jun 8 | — | 730–1095 |
| Boysenberries | — | — | Jun 8 | — | 365–730 |
| Cantaloupe | — | — | Jun 8 | Aug 17 – Sep 21 | 70–90 |
| Che Fruit | — | — | Jun 8 | — | 1095–1825 |
| Cranberries | — | — | Jun 8 | — | 730–1095 |
| Currants | — | — | Jun 8 | — | 730–1095 |
| Elderberries | — | — | Jun 8 | — | 730–1095 |
| Goji Berries | — | — | Jun 8 | — | 730–1095 |
| Gooseberries | — | — | Jun 8 | — | 730–1095 |
| Grapes | — | — | Jun 8 | — | 730–1095 |
| Ground Cherry | — | — | Jun 8 | Aug 17 – Oct 12 | 65–80 |
| Hardy Kiwi | — | — | Jun 8 | — | 1095–1825 |
| Haskaps | — | — | Jun 8 | — | 730–1095 |
| Honeydew | — | — | Jun 8 | Aug 31 – Oct 12 | 80–110 |
| Jostaberry | — | — | Jun 8 | — | 730–1095 |
| Lingonberries | — | — | Jun 8 | — | 730–1095 |
| Medlar | — | — | Jun 8 | — | 1095–1825 |
| Mulberries | — | — | Jun 8 | — | 730–1825 |
| Pawpaw | — | — | Jun 8 | — | 1095–2555 |
| Persimmon | — | — | Jun 8 | — | 1095–2555 |
| Quince | — | — | Jun 8 | — | 1095–1825 |
| Raspberries | — | — | Jun 8 | — | 365–730 |
| Serviceberries | — | — | Jun 8 | — | 730–1095 |
| Strawberries | — | — | Jun 8 | Sep 7 – Nov 23 | 90–365 |
🌿 Herbs to Grow in Boise County
37 herbs that grow well in Zone 5b with planting dates for Boise County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 13 | May 4 | May 11 | — | 365–730 |
| Anise | Apr 13 | May 4 | May 11 | Aug 10 – Oct 26 | 90–120 |
| Basil | Mar 30 | May 25 | Jun 1 | Jul 27 – Sep 28 | 50–75 |
| Bee Balm | — | — | May 25 | Aug 24 – Nov 9 | 90–120 |
| Borage | Apr 13 | May 4 | May 11 | Jul 6 – Aug 24 | 50–60 |
| Caraway | Apr 13 | May 4 | May 11 | — | 365–450 |
| Catnip | — | — | May 25 | Jul 27 – Sep 28 | 60–80 |
| Chamomile | Apr 13 | May 4 | May 11 | Jul 13 – Sep 21 | 60–90 |
| Chervil | Apr 13 | May 4 | May 11 | Jun 22 – Aug 24 | 40–60 |
| Chives | — | — | May 25 | Jul 27 – Oct 5 | 60–90 |
| Cilantro | Apr 13 | May 4 | May 11 | Jun 22 – Aug 24 | 40–60 |
| Comfrey | — | — | May 25 | Jul 27 – Oct 5 | 60–90 |
| Cumin | Apr 13 | May 4 | May 11 | Aug 24 – Oct 26 | 100–120 |
| Dill | Apr 13 | May 4 | May 11 | Jun 22 – Aug 24 | 40–60 |
| Echinacea | — | — | May 25 | Sep 28 – Nov 9 | 120–180 |
| Epazote | Mar 30 | May 25 | Jun 1 | Jul 20 – Sep 14 | 45–60 |
| Fennel (herb) | Apr 13 | May 4 | May 11 | Jul 13 – Sep 21 | 60–90 |
| Feverfew | — | — | May 25 | Aug 24 – Nov 9 | 90–120 |
| Garlic Chives | — | — | May 25 | Jul 27 – Oct 5 | 60–90 |
| Horehound | — | — | May 25 | Aug 10 – Oct 5 | 75–90 |
| Hyssop | — | — | May 25 | Aug 3 – Oct 5 | 70–90 |
| Lavender | — | — | May 25 | Aug 24 – Nov 9 | 90–200 |
| Lemon Balm | — | — | May 25 | Jul 27 – Sep 14 | 60–70 |
| Lemon Thyme | — | — | May 25 | Aug 3 – Oct 5 | 70–90 |
| Lovage | — | — | May 25 | Aug 3 – Oct 5 | 70–90 |
| Mint | — | — | May 25 | Jul 27 – Oct 5 | 60–90 |
| Oregano | — | — | May 25 | Jul 27 – Oct 5 | 60–90 |
| Parsley | Apr 13 | May 4 | May 11 | Jul 13 – Sep 14 | 60–80 |
| Rue | — | — | May 25 | Aug 3 – Oct 5 | 70–90 |
| Sage | — | — | May 25 | Aug 10 – Oct 5 | 75–90 |
| Savory | — | — | May 25 | Jul 20 – Sep 14 | 50–70 |
| Sorrel | Apr 13 | May 4 | May 11 | Jun 22 – Aug 24 | 40–60 |
| Tarragon | — | — | May 25 | Jul 27 – Oct 5 | 60–90 |
| Thai Basil | Mar 30 | May 25 | Jun 1 | Jul 27 – Sep 28 | 50–75 |
| Thyme | — | — | May 25 | Aug 3 – Oct 5 | 70–90 |
| Valerian | — | — | May 25 | Sep 28 – Nov 9 | 120–180 |
| Yarrow | — | — | May 25 | Aug 24 – Nov 9 | 90–120 |
Monthly Planting Guide for Boise County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Boise County.
Frequently Asked Questions
What planting zone is Boise County, ID?
Boise County is in USDA Hardiness Zone 5b. 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 Boise County, ID?
Based on 31 years of NOAA weather station data, the median last spring frost in Boise County falls around May 18. In 8 out of 10 years, last frost lands between April 18 and June 16 — a 59-day window of variability. Use June 16 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Boise County, ID?
The median first fall frost in Boise County arrives around September 27. In cold years it can arrive as early as September 3; in mild years as late as October 25. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Boise County?
Boise County has a frost-free growing season of approximately 132 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 longer by about 6.27 days per decade.
What is the soil like in Boise County for gardening?
Boise 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 Boise County?
Boise County has commercial agriculture that includes Wheat, Potatoes, Hay. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Boise County a good location for home gardening?
Boise County scores 32/100 (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.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Boise County gardeners in Zone 5b organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.
