Bonneville County, ID — Planting Guide
May to-do list for Bonneville County, Idaho
If you only do a handful of things in the garden this May, make it these. They're sequenced around your zone's frost timing.
-
Transplant kale, lettuce, and angelica outside
Bring a watering can to the bed. Each transplant gets a drink the moment it's in the ground, not ten minutes later.
-
Direct-sow carrots, kale, and lettuce
These tolerate cool soil, so you're not gambling by sowing now.
To set up a strong June, finish these tasks
- Transplants going out: basil, cucumber, and peppers
- Direct-sowing: basil, cucumber, and green beans
- Starting indoors: cucumber, kale, and lettuce
- First harvests: lettuce, radish, and arugula
Bonneville County is in USDA Zone 5b. The average last spring frost is May 26 and the first fall frost is September 19, giving you a growing season of approximately 116 days.
At an elevation of 7,993 ft, Bonneville County receives approximately 20.9 in of rainfall annually. Summer highs average 85°F with winter lows around 11°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 50 days year to year — ranging from May 1 in warm years to June 21 in cold years. The growing season is trending longer by about 7.85 days per decade. Bonneville County scores 30/100 (Challenging) on the Microclimate Index.
🌡️ Zone
5b (°F to °F min)
❄️ Last Frost
May 26
🍂 First Frost
September 19
📅 Growing Season
116 days
⛰️ Elevation
7,993 ft
🌧️ Annual Rainfall
20.9 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 | 1.5 in | 6 days | — | None |
| Feb | 1.2 in | 5 days | — | None |
| Mar | 2 in | 7 days | — | None |
| Apr | 2.4 in | 8 days | 1.9 in | High |
| May | 2.2 in | 9 days | 2.1 in | High |
| Jun | 1.7 in | 4 days | 2.6 in | High |
| Jul | 2.1 in | 6 days | 2.2 in | High |
| Aug | 1.9 in | 7 days | 2.4 in | High |
| Sep | 1.7 in | 6 days | 2.6 in | High |
| Oct | 1.9 in | 5 days | 2.4 in | High |
| Nov | 1.4 in | 6 days | — | None |
| Dec | 1.1 in | 7 days | — | None |
Annual total: 21.1 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.
Bonneville County Soil Profile
Soil Type
Loam
Soil pH
6.5-8
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 21 | Oct 12 | 113 days |
| Cautious | Jun 9 | Sep 29 | 112 days |
| Average year | May 26 | Sep 19 | 116 days |
| Optimistic | May 13 | Sep 7 | 117 days |
| Aggressive (risky) | May 1 | Sep 3 | 125 days |
Not very — frost dates can vary by ±50 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 7.9 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Bonneville County has challenging growing conditions. Season extension and careful variety selection are essential.
Local Gardening Help in Bonneville 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 Bonneville County's climate and soil.
County Extension Office
Bonneville 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 Bonneville County
Finding local nurseries & garden centers in Bonneville County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Bonneville 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 Bonneville County ID" or "garden center Bonneville 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 Bonneville County ID" or check your extension office and local parks department. Facebook groups like "Bonneville 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.
Sunlight & Day Length
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
15.2 hours
Summer solstice daylight
Shortest Day
8.8 hours
Winter solstice daylight
Peak Sun Hours
10.8 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 hr | Short day |
| February | 10.3 hr | 6 hr | Short day |
| March | 11.6 hr | 6.9 hr | Short day |
| April | 13.2 hr | 7.6 hr | Neutral |
| May | 14.5 hr | 9.2 hr | Long day |
| June | 15.2 hr | 10.8 hr | Long day |
| July | 14.9 hr | 10.7 hr | Long day |
| August | 13.8 hr | 9.6 hr | Neutral |
| September | 12.3 hr | 8.2 hr | Neutral |
| October | 10.8 hr | 7.3 hr | Short day |
| November | 9.4 hr | 5.7 hr | Short day |
| December | 8.8 hr | 4.8 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 | -2°F | 6°F | ❄️ Dormant | ~36 weeks |
| Feb | -2°F | 5°F | ❄️ Dormant | ~36 weeks |
| Mar | 8°F | 10°F | ❄️ Dormant | ~36 weeks |
| Apr | 21°F | 20°F | ❄️ Dormant | ~36 weeks |
| May | 32°F | 32°F | ❄️ Dormant | ~36 weeks |
| Jun | 46°F | 39°F | 🐢 Slow | ~24 weeks |
| Jul | 54°F | 48°F | ♻️ Active | ~14 weeks |
| Aug | 52°F | 49°F | ♻️ Active | ~14 weeks |
| Sep | 46°F | 45°F | 🐢 Slow | ~24 weeks |
| Oct | 33°F | 35°F | ❄️ Dormant | ~36 weeks |
| Nov | 17°F | 26°F | ❄️ Dormant | ~36 weeks |
| Dec | 4°F | 14°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 Bonneville 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 | Moderate | Jun, Jul, Aug |
| Tomato hornworms | Low | 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 Bonneville 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 28 | Jul 25 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Jun 5 | Jul 18 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | May 1 | Jul 18 | ✓ 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 16 | Aug 29 | — | 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 | Jul 10 | May 12 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 10 | May 12 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 6 | May 5 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 7 | May 5 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 27 | May 5 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 28 | May 5 | — | 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: 15 mph Summer: 11 mph
Fall: 12 mph Winter: 15 mph
Prevailing wind: W. Windy area — plant a windbreak hedge on the W side of your garden.
Windbreak Benefit
7.3/10
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 1,479 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
10,516 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
Mar, Apr, May, Jul
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 21.1 inches of rain per year
- A 1,000 sq ft roof can collect roughly 10,516 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 Bonneville County
Soil Type
Loam
Soil pH 6.5–8 · 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
116-day frost-free season
A short season means indoor starts are critical for warm-season crops. Prioritise cold-hardy, fast-maturing varieties and use row covers to extend autumn harvests.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 24-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 Bonneville County
106 vegetables that grow well in Zone 5b with planting dates for Bonneville County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 21 | Jun 2 | Jun 9 | Sep 1 – Oct 6 | 80–100 |
| Amaranth | Mar 31 | Jun 2 | Jun 9 | Sep 8 – Oct 27 | 90–120 |
| Arugula | Apr 21 | May 12 | May 26 | Jun 30 – Sep 1 | 30–50 |
| Asparagus | — | — | Jun 9 | — | 730–1095 |
| Beets | — | May 12 | — | Jul 7 – Aug 4 | 50–70 |
| Belgian Endive | Apr 21 | May 12 | May 26 | Sep 15 – Nov 10 | 110–150 |
| Bitter Melon | Mar 31 | Jun 2 | Jun 9 | Aug 11 – Sep 22 | 60–90 |
| Black Beans | — | Jun 2 | — | Sep 1 – Oct 20 | 90–120 |
| Bok Choy | Apr 21 | May 12 | May 26 | Jul 7 – Aug 11 | 40–60 |
| Broccoli | Apr 21 | May 12 | May 26 | Jul 28 – Sep 8 | 60–90 |
| Broccoli Rabe | Apr 21 | May 12 | May 26 | Jul 7 – Aug 11 | 40–60 |
| Brussels Sprouts | Apr 21 | May 12 | May 26 | Aug 25 – Oct 20 | 90–130 |
| Butternut Squash | Apr 21 | Jun 2 | Jun 9 | Sep 8 – Oct 13 | 85–110 |
| Cabbage | Apr 21 | May 12 | May 26 | Jul 28 – Sep 22 | 60–100 |
| Calabash | Mar 31 | Jun 2 | Jun 9 | Sep 1 – Oct 27 | 80–120 |
| Carrots | — | May 12 | — | Jul 14 – Aug 18 | 60–80 |
| Cauliflower | Apr 21 | May 12 | May 26 | Jul 21 – Sep 22 | 55–100 |
| Celeriac | Apr 21 | May 12 | May 26 | Sep 8 – Oct 13 | 100–120 |
| Celery | Apr 21 | May 12 | May 26 | Aug 18 – Oct 13 | 80–120 |
| Celtuce | Apr 21 | May 12 | May 26 | Jul 28 – Sep 8 | 60–90 |
| Chard | Apr 21 | May 12 | May 26 | Jul 21 – Sep 8 | 50–60 |
| Chickpeas | Apr 21 | May 12 | May 26 | Aug 18 – Sep 29 | 80–110 |
| Chicory | Apr 21 | May 12 | May 26 | Jul 28 – Sep 8 | 60–85 |
| Chinese Cabbage | Apr 21 | May 12 | May 26 | Jul 21 – Aug 18 | 50–70 |
| Christmas Lima Beans | Mar 31 | Jun 2 | Jun 9 | Sep 1 – Oct 6 | 80–100 |
| Collard Greens | Apr 21 | May 12 | May 26 | Jul 21 – Sep 22 | 55–75 |
| Corn | — | Jun 2 | — | Aug 4 – Sep 29 | 60–100 |
| Cowpeas | — | Jun 2 | — | Aug 4 – Sep 15 | 60–90 |
| Cress | Apr 21 | May 12 | May 26 | Jun 9 – Jun 30 | 14–21 |
| Crookneck Squash | Apr 21 | Jun 2 | Jun 9 | Jul 28 – Aug 25 | 45–60 |
| Crosne | — | May 12 | — | Oct 13 – Oct 27 | 150–200 |
| Cucumber | Apr 21 | Jun 2 | Jun 9 | Aug 4 – Sep 29 | 50–70 |
| Daikon | — | May 12 | — | Jul 7 – Aug 4 | 50–70 |
| Delicata Squash | Apr 21 | Jun 2 | Jun 9 | Sep 1 – Oct 6 | 80–100 |
| Edamame | — | Jun 2 | — | Aug 18 – Sep 29 | 75–100 |
| Eggplant | Mar 17 | Jun 2 | Jun 9 | Aug 18 – Oct 20 | 65–85 |
| Endive | Apr 21 | May 12 | May 26 | Jul 14 – Aug 18 | 45–65 |
| Escarole | Apr 21 | May 12 | May 26 | Jul 21 – Aug 18 | 50–70 |
| Fava Beans | Apr 21 | May 12 | May 26 | Aug 11 – Sep 22 | 75–100 |
| Fennel | Mar 31 | Jun 2 | Jun 9 | Aug 11 – Sep 22 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Jun 2 | — | Jul 28 – Sep 22 | 50–65 |
| Horseradish | — | — | Jun 9 | Oct 13 – Nov 24 | 120–180 |
| Hot Peppers | Mar 17 | Jun 2 | Jun 9 | Aug 18 – Nov 24 | 70–120 |
| Hubbard Squash | Apr 21 | Jun 2 | Jun 9 | Sep 22 – Oct 27 | 100–120 |
| Kabocha | Apr 21 | Jun 2 | Jun 9 | Sep 8 – Oct 6 | 85–100 |
| Kai Lan | Apr 21 | May 12 | May 26 | Jul 14 – Aug 11 | 45–60 |
| Kale | Apr 21 | May 12 | May 26 | Jul 21 – Sep 15 | 50–70 |
| Kidney Beans | — | Jun 2 | — | Sep 1 – Oct 6 | 85–110 |
| Kohlrabi | Apr 21 | May 12 | May 26 | Jul 14 – Aug 18 | 45–65 |
| Komatsuna | Apr 21 | May 12 | May 26 | Jun 30 – Aug 4 | 35–50 |
| Leeks | Apr 21 | May 12 | May 26 | Aug 25 – Nov 10 | 90–150 |
| Lentils | Apr 21 | May 12 | May 26 | Aug 18 – Sep 29 | 80–110 |
| Lettuce | Apr 21 | May 12 | May 26 | Jun 30 – Sep 8 | 30–60 |
| Lima Beans | — | Jun 2 | — | Aug 4 – Sep 15 | 60–90 |
| Mache | Apr 21 | May 12 | May 26 | Jul 7 – Aug 11 | 40–60 |
| Melon | Apr 21 | Jun 2 | Jun 9 | Aug 18 – Oct 6 | 70–100 |
| Microgreens | Apr 21 | May 12 | May 26 | Jun 2 – Jun 30 | 7–21 |
| Mitsuba | Apr 21 | May 12 | May 19 | Jul 14 – Sep 8 | 50–70 |
| Mizuna | Apr 21 | May 12 | May 26 | Jun 30 – Jul 28 | 30–45 |
| Mustard Greens | Apr 21 | May 12 | May 26 | Jun 30 – Sep 1 | 30–50 |
| Napa Cabbage | Apr 21 | May 12 | May 26 | Jul 21 – Aug 25 | 55–75 |
| New Zealand Spinach | Mar 31 | Jun 2 | Jun 9 | Aug 4 – Sep 1 | 55–70 |
| Okra | Mar 31 | Jun 2 | Jun 9 | Aug 4 – Sep 29 | 50–65 |
| Onion | Apr 21 | May 12 | May 26 | Aug 25 – Oct 13 | 90–120 |
| Pac Choi | Apr 21 | May 12 | May 26 | Jul 7 – Aug 4 | 40–55 |
| Parsnip | — | May 12 | — | Aug 25 – Oct 6 | 100–130 |
| Patty Pan Squash | Apr 21 | Jun 2 | Jun 9 | Jul 28 – Aug 25 | 45–60 |
| Peas | Apr 21 | May 12 | May 26 | Jul 21 – Sep 15 | 55–70 |
| Peppers | Mar 17 | Jun 2 | Jun 9 | Aug 11 – Oct 20 | 60–90 |
| Pole Beans | Mar 31 | Jun 2 | Jun 9 | Aug 4 – Sep 29 | 55–70 |
| Potatoes | Mar 31 | Jun 2 | Jun 9 | Aug 18 – Oct 27 | 70–120 |
| Pumpkin | Apr 21 | Jun 2 | Jun 9 | Sep 8 – Oct 27 | 85–120 |
| Purslane | Apr 21 | May 12 | May 26 | Jul 7 – Aug 11 | 40–60 |
| Radicchio | Apr 21 | May 12 | May 26 | Jul 28 – Sep 1 | 60–80 |
| Radish | — | May 12 | — | Jun 9 – Jun 30 | 22–35 |
| Rhubarb | — | — | Jun 16 | — | 365–730 |
| Romanesco | Apr 21 | May 12 | May 26 | Aug 11 – Sep 22 | 75–100 |
| Rutabaga | — | May 12 | — | Aug 4 – Sep 8 | 80–100 |
| Salsify | — | May 12 | — | Aug 25 – Oct 6 | 100–130 |
| Savoy Cabbage | Apr 21 | May 12 | May 26 | Aug 4 – Sep 29 | 70–110 |
| Scallions | Apr 21 | May 12 | May 26 | Jul 21 – Aug 18 | 50–70 |
| Scarlet Runner Beans | Mar 31 | Jun 2 | Jun 9 | Aug 11 – Sep 15 | 60–80 |
| Shallot | Apr 21 | May 12 | May 26 | Aug 25 – Oct 13 | 90–120 |
| Shiso | Apr 7 | Jun 2 | Jun 9 | Aug 4 – Sep 29 | 50–70 |
| Snap Peas | Mar 31 | Jun 2 | Jun 9 | Aug 4 – Sep 29 | 55–70 |
| Snow Peas | Apr 21 | May 12 | May 26 | Jul 21 – Sep 15 | 50–65 |
| Soybeans | — | Jun 2 | — | Aug 25 – Oct 20 | 80–120 |
| Spaghetti Squash | Apr 21 | Jun 2 | Jun 9 | Sep 8 – Oct 6 | 85–100 |
| Spinach | Apr 21 | May 12 | May 26 | Jun 30 – Sep 1 | 35–50 |
| Squash (Summer) | Apr 21 | Jun 2 | Jun 9 | Jul 28 – Sep 29 | 45–65 |
| Squash (Winter) | Apr 21 | Jun 2 | Jun 9 | Sep 1 – Oct 27 | 80–120 |
| Sunchoke | — | — | Jun 9 | Sep 29 – Nov 24 | 110–150 |
| Sunflower | Mar 31 | Jun 2 | Jun 9 | Aug 18 – Oct 6 | 70–100 |
| Sweet Corn | — | Jun 2 | — | Aug 4 – Sep 15 | 60–90 |
| Sweet Potatoes | Mar 31 | Jun 2 | Jun 9 | Sep 8 – Oct 27 | 90–120 |
| Tatsoi | Apr 21 | May 12 | May 26 | Jun 30 – Aug 4 | 35–50 |
| Tomatillo | Mar 31 | Jun 2 | Jun 9 | Aug 11 – Oct 20 | 60–85 |
| Tomatoes | Mar 31 | Jun 2 | Jun 9 | Aug 11 – Oct 20 | 60–85 |
| Turnip | — | May 12 | — | Jun 23 – Jul 28 | 40–60 |
| Watercress | Apr 21 | May 12 | May 26 | Jul 7 – Aug 11 | 40–60 |
| Watermelon | Apr 21 | Jun 2 | Jun 9 | Aug 18 – Oct 6 | 70–100 |
| Wax Beans | — | Jun 2 | — | Jul 28 – Sep 22 | 50–65 |
| Winter Melon | Mar 31 | Jun 2 | Jun 9 | Sep 8 – Oct 27 | 90–120 |
| Yard Long Beans | Mar 31 | Jun 2 | Jun 9 | Aug 4 – Sep 15 | 55–80 |
| Zucchini | Apr 21 | Jun 2 | Jun 9 | Jul 28 – Sep 22 | 45–60 |
🍓 Fruits to Grow in Bonneville County
27 fruits that grow well in Zone 5b with planting dates for Bonneville County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 16 | Sep 15 – Dec 1 | 90–180 |
| Aronia | — | — | Jun 16 | — | 730–1095 |
| Blackberries | — | — | Jun 16 | — | 365–730 |
| Blueberries | — | — | Jun 16 | — | 730–1095 |
| Boysenberries | — | — | Jun 16 | — | 365–730 |
| Cantaloupe | — | — | Jun 16 | Aug 25 – Sep 29 | 70–90 |
| Che Fruit | — | — | Jun 16 | — | 1095–1825 |
| Cranberries | — | — | Jun 16 | — | 730–1095 |
| Currants | — | — | Jun 16 | — | 730–1095 |
| Elderberries | — | — | Jun 16 | — | 730–1095 |
| Goji Berries | — | — | Jun 16 | — | 730–1095 |
| Gooseberries | — | — | Jun 16 | — | 730–1095 |
| Grapes | — | — | Jun 16 | — | 730–1095 |
| Ground Cherry | — | — | Jun 16 | Aug 25 – Oct 20 | 65–80 |
| Hardy Kiwi | — | — | Jun 16 | — | 1095–1825 |
| Haskaps | — | — | Jun 16 | — | 730–1095 |
| Honeydew | — | — | Jun 16 | Sep 8 – Oct 20 | 80–110 |
| Jostaberry | — | — | Jun 16 | — | 730–1095 |
| Lingonberries | — | — | Jun 16 | — | 730–1095 |
| Medlar | — | — | Jun 16 | — | 1095–1825 |
| Mulberries | — | — | Jun 16 | — | 730–1825 |
| Pawpaw | — | — | Jun 16 | — | 1095–2555 |
| Persimmon | — | — | Jun 16 | — | 1095–2555 |
| Quince | — | — | Jun 16 | — | 1095–1825 |
| Raspberries | — | — | Jun 16 | — | 365–730 |
| Serviceberries | — | — | Jun 16 | — | 730–1095 |
| Strawberries | — | — | Jun 16 | Sep 15 – Dec 1 | 90–365 |
🌿 Herbs to Grow in Bonneville County
37 herbs that grow well in Zone 5b with planting dates for Bonneville County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 21 | May 12 | May 19 | — | 365–730 |
| Anise | Apr 21 | May 12 | May 19 | Aug 18 – Nov 3 | 90–120 |
| Basil | Apr 7 | Jun 2 | Jun 9 | Aug 4 – Oct 6 | 50–75 |
| Bee Balm | — | — | Jun 2 | Sep 1 – Nov 17 | 90–120 |
| Borage | Apr 21 | May 12 | May 19 | Jul 14 – Sep 1 | 50–60 |
| Caraway | Apr 21 | May 12 | May 19 | — | 365–450 |
| Catnip | — | — | Jun 2 | Aug 4 – Oct 6 | 60–80 |
| Chamomile | Apr 21 | May 12 | May 19 | Jul 21 – Sep 29 | 60–90 |
| Chervil | Apr 21 | May 12 | May 19 | Jun 30 – Sep 1 | 40–60 |
| Chives | — | — | Jun 2 | Aug 4 – Oct 13 | 60–90 |
| Cilantro | Apr 21 | May 12 | May 19 | Jun 30 – Sep 1 | 40–60 |
| Comfrey | — | — | Jun 2 | Aug 4 – Oct 13 | 60–90 |
| Cumin | Apr 21 | May 12 | May 19 | Sep 1 – Nov 3 | 100–120 |
| Dill | Apr 21 | May 12 | May 19 | Jun 30 – Sep 1 | 40–60 |
| Echinacea | — | — | Jun 2 | Oct 6 – Nov 17 | 120–180 |
| Epazote | Apr 7 | Jun 2 | Jun 9 | Jul 28 – Sep 22 | 45–60 |
| Fennel (herb) | Apr 21 | May 12 | May 19 | Jul 21 – Sep 29 | 60–90 |
| Feverfew | — | — | Jun 2 | Sep 1 – Nov 17 | 90–120 |
| Garlic Chives | — | — | Jun 2 | Aug 4 – Oct 13 | 60–90 |
| Horehound | — | — | Jun 2 | Aug 18 – Oct 13 | 75–90 |
| Hyssop | — | — | Jun 2 | Aug 11 – Oct 13 | 70–90 |
| Lavender | — | — | Jun 2 | Sep 1 – Nov 17 | 90–200 |
| Lemon Balm | — | — | Jun 2 | Aug 4 – Sep 22 | 60–70 |
| Lemon Thyme | — | — | Jun 2 | Aug 11 – Oct 13 | 70–90 |
| Lovage | — | — | Jun 2 | Aug 11 – Oct 13 | 70–90 |
| Mint | — | — | Jun 2 | Aug 4 – Oct 13 | 60–90 |
| Oregano | — | — | Jun 2 | Aug 4 – Oct 13 | 60–90 |
| Parsley | Apr 21 | May 12 | May 19 | Jul 21 – Sep 22 | 60–80 |
| Rue | — | — | Jun 2 | Aug 11 – Oct 13 | 70–90 |
| Sage | — | — | Jun 2 | Aug 18 – Oct 13 | 75–90 |
| Savory | — | — | Jun 2 | Jul 28 – Sep 22 | 50–70 |
| Sorrel | Apr 21 | May 12 | May 19 | Jun 30 – Sep 1 | 40–60 |
| Tarragon | — | — | Jun 2 | Aug 4 – Oct 13 | 60–90 |
| Thai Basil | Apr 7 | Jun 2 | Jun 9 | Aug 4 – Oct 6 | 50–75 |
| Thyme | — | — | Jun 2 | Aug 11 – Oct 13 | 70–90 |
| Valerian | — | — | Jun 2 | Oct 6 – Nov 17 | 120–180 |
| Yarrow | — | — | Jun 2 | Sep 1 – Nov 17 | 90–120 |
Monthly Planting Guide for Bonneville County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Bonneville County.
Frequently Asked Questions
What planting zone is Bonneville County, ID?
Bonneville 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 Bonneville County, ID?
Based on 31 years of NOAA weather station data, the median last spring frost in Bonneville County falls around May 26. In 8 out of 10 years, last frost lands between May 1 and June 21 — a 50-day window of variability. Use June 21 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Bonneville County, ID?
The median first fall frost in Bonneville County arrives around September 19. In cold years it can arrive as early as September 3; in mild years as late as October 12. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Bonneville County?
Bonneville County has a frost-free growing season of approximately 116 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 7.85 days per decade.
What is the soil like in Bonneville County for gardening?
Bonneville County has predominantly Loam soil with a pH range of 6.5–8 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Bonneville County?
Bonneville County has commercial agriculture that includes Potatoes, Hay, Wheat, Barley, Sugar Beets. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Bonneville County a good location for home gardening?
Bonneville County scores 30/100 (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 Bonneville County Garden Planner — Free
A 24-page printable planner built for Bonneville County (Zone 5b). 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