Powell County, MT — Planting Guide
May in Powell County, Montana — your action list
Each item below is timed to Powell County, Montana's frost dates and soil temperatures. Skip nothing, stress about nothing.
-
Time to transplant angelica, anise, and borage
Pinch off the lowest leaves on each seedling before you plant — it reduces water loss while the roots catch up.
-
Sow carrots, kale, and lettuce where they'll grow
Your soil is 40°F — warm enough for these to germinate without babying.
June will be here before you know it — start on
- Transplants going out: basil, cucumber, and kale
- Direct-sowing: basil, cucumber, and green beans
- First harvests: radish, cress, and microgreens
- Fall sowing: carrots, kale, and lettuce
Powell County is in USDA Zone 4b. The average last spring frost is June 6 and the first fall frost is September 8, giving you a growing season of approximately 94 days.
At an elevation of 5,514 ft, Powell County receives approximately 22.9 in of rainfall annually. Summer highs average 84°F with winter lows around 4°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 40 days year to year — ranging from May 11 in warm years to June 20 in cold years. The growing season is trending longer by about 7.57 days per decade. Powell County scores 36/100 (Challenging) on the Microclimate Index.
🌡️ Zone
4b (°F to °F min)
❄️ Last Frost
June 6
🍂 First Frost
September 8
📅 Growing Season
94 days
⛰️ Elevation
5,514 ft
🌧️ Annual Rainfall
22.9 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 | 1.6 in | 7 days | — | None |
| Feb | 1.2 in | 5 days | — | None |
| Mar | 2 in | 8 days | — | None |
| Apr | 2.4 in | 7 days | 1.9 in | High |
| May | 3 in | 8 days | 1.3 in | Moderate |
| Jun | 1.4 in | 4 days | 2.9 in | High |
| Jul | 2.1 in | 5 days | 2.2 in | High |
| Aug | 2.2 in | 7 days | 2.1 in | High |
| Sep | 1.8 in | 5 days | 2.5 in | High |
| Oct | 2.1 in | 6 days | 2.2 in | High |
| Nov | 1.7 in | 5 days | — | None |
| Dec | 1.3 in | 7 days | — | None |
Annual total: 22.8 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.
Powell County Soil Profile
Soil Type
Loam
Soil pH
6.5-8.2
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 20 | Oct 1 | 103 days |
| Cautious | Jun 11 | Sep 18 | 99 days |
| Average year | Jun 6 | Sep 8 | 94 days |
| Optimistic | May 20 | Aug 31 | 103 days |
| Aggressive (risky) | May 11 | Aug 18 | 99 days |
Not very — frost dates can vary by ±40 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 7.6 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Powell County has challenging growing conditions. Season extension and careful variety selection are essential.
Local Gardening Help in Powell 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 Powell County's climate and soil.
County Extension Office
Powell County Montana State University Extension Extension Office
Phone: 406-994-3402
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 Powell County
Finding local nurseries & garden centers in Powell County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Powell 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 Powell County MT" or "garden center Powell 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 Powell County MT" or check your extension office and local parks department. Facebook groups like "Powell County Gardeners" or "Montana 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
15.6 hours
Summer solstice daylight
Shortest Day
8.3 hours
Winter solstice daylight
Peak Sun Hours
11.3 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 | 8.7 hr | 4.8 hr | Short day |
| February | 10.1 hr | 6 hr | Short day |
| March | 11.6 hr | 6.7 hr | Short day |
| April | 13.4 hr | 7.7 hr | Neutral |
| May | 14.8 hr | 9.2 hr | Long day |
| June | 15.6 hr | 11.3 hr | Long day |
| July | 15.3 hr | 10.7 hr | Long day |
| August | 14 hr | 9.5 hr | Long day |
| September | 12.3 hr | 9 hr | Neutral |
| October | 10.6 hr | 7 hr | Short day |
| November | 9.1 hr | 5 hr | Short day |
| December | 8.3 hr | 4.5 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 | 8°F | ❄️ Dormant | ~36 weeks |
| Feb | -1°F | 6°F | ❄️ Dormant | ~36 weeks |
| Mar | 10°F | 13°F | ❄️ Dormant | ~36 weeks |
| Apr | 25°F | 23°F | ❄️ Dormant | ~36 weeks |
| May | 40°F | 35°F | 🐢 Slow | ~24 weeks |
| Jun | 47°F | 43°F | 🐢 Slow | ~24 weeks |
| Jul | 57°F | 50°F | ♻️ Active | ~14 weeks |
| Aug | 56°F | 54°F | ♻️ Active | ~14 weeks |
| Sep | 49°F | 47°F | 🐢 Slow | ~24 weeks |
| Oct | 37°F | 39°F | ❄️ Dormant | ~36 weeks |
| Nov | 22°F | 27°F | ❄️ Dormant | ~36 weeks |
| Dec | 6°F | 17°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 Powell 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 5 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Cabbage worms | Low | Jun, Jul, Aug |
| Colorado potato beetle | Moderate | Jun, Jul |
| Flea beetles | Moderate | May, Jun, Jul |
| Slugs | Low | May, Jun, Jul, Aug, Sep |
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 Powell County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (2 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Jun 11 | Jun 30 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | May 7 | Jul 7 | ✓ 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 21 | Aug 18 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (5 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Daikon radish | Jul 11 | May 16 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jun 19 | May 16 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Jul 27 | May 16 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 17 | May 16 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 6 | May 16 | — | 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: 12 mph
Fall: 11 mph Winter: 15 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 2,067 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
11,363 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, Jul, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Feb, Jun, 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 22.8 inches of rain per year
- A 1,000 sq ft roof can collect roughly 11,363 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Feb, Jun, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Powell County
Soil Type
Loam
Soil pH 6.5–8.2 · Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
Watering Needs
Drought stress: 5.5/10
Moderate drought pressure. Drip irrigation and mulching are highly recommended to maintain soil moisture through summer.
Season Tips
94-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 Powell County
96 vegetables that grow well in Zone 4b with planting dates for Powell County.
Show all 96 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 25 | Jun 20 | Jun 27 | Sep 19 – Oct 24 | 80–100 |
| Amaranth | Apr 4 | Jun 20 | Jun 27 | Sep 26 – Nov 14 | 90–120 |
| Arugula | Apr 25 | May 30 | Jun 6 | Jul 11 – Sep 12 | 30–50 |
| Asparagus | — | — | Jun 20 | — | 730–1095 |
| Beets | — | May 30 | — | Jul 25 – Aug 22 | 50–70 |
| Belgian Endive | Apr 25 | May 30 | Jun 6 | Sep 26 – Oct 31 | 110–150 |
| Black Beans | — | Jun 20 | — | Sep 19 – Nov 7 | 90–120 |
| Bok Choy | Apr 25 | May 30 | Jun 6 | Jul 18 – Aug 22 | 40–60 |
| Broccoli | Apr 25 | May 30 | Jun 6 | Aug 8 – Sep 19 | 60–90 |
| Broccoli Rabe | Apr 25 | May 30 | Jun 6 | Jul 18 – Aug 22 | 40–60 |
| Brussels Sprouts | Apr 25 | May 30 | Jun 6 | Sep 5 – Oct 31 | 90–130 |
| Butternut Squash | Apr 25 | Jun 20 | Jun 27 | Sep 26 – Oct 31 | 85–110 |
| Cabbage | Apr 25 | May 30 | Jun 6 | Aug 8 – Oct 3 | 60–100 |
| Carrots | — | May 30 | — | Aug 1 – Sep 5 | 60–80 |
| Cauliflower | Apr 25 | May 30 | Jun 6 | Aug 1 – Oct 3 | 55–100 |
| Celeriac | Apr 25 | May 30 | Jun 6 | Sep 19 – Oct 24 | 100–120 |
| Celery | Apr 25 | May 30 | Jun 6 | Aug 29 – Oct 24 | 80–120 |
| Celtuce | Apr 25 | May 30 | Jun 6 | Aug 8 – Sep 19 | 60–90 |
| Chard | Apr 25 | May 30 | Jun 6 | Aug 1 – Sep 19 | 50–60 |
| Chickpeas | Apr 25 | May 30 | Jun 6 | Aug 29 – Oct 10 | 80–110 |
| Chicory | Apr 25 | May 30 | Jun 6 | Aug 8 – Sep 19 | 60–85 |
| Chinese Cabbage | Apr 25 | May 30 | Jun 6 | Aug 1 – Aug 29 | 50–70 |
| Christmas Lima Beans | Apr 4 | Jun 20 | Jun 27 | Sep 19 – Oct 24 | 80–100 |
| Collard Greens | Apr 25 | May 30 | Jun 6 | Aug 1 – Oct 3 | 55–75 |
| Corn | — | Jun 20 | — | Aug 22 – Oct 17 | 60–100 |
| Cress | Apr 25 | May 30 | Jun 6 | Jun 20 – Jul 11 | 14–21 |
| Crookneck Squash | Apr 25 | Jun 20 | Jun 27 | Aug 15 – Sep 12 | 45–60 |
| Crosne | — | May 30 | — | Oct 31 – Oct 24 | 150–200 |
| Cucumber | Apr 25 | Jun 20 | Jun 27 | Aug 22 – Oct 17 | 50–70 |
| Daikon | — | May 30 | — | Jul 25 – Aug 22 | 50–70 |
| Delicata Squash | Apr 25 | Jun 20 | Jun 27 | Sep 19 – Oct 24 | 80–100 |
| Edamame | — | Jun 20 | — | Sep 5 – Oct 17 | 75–100 |
| Endive | Apr 25 | May 30 | Jun 6 | Jul 25 – Aug 29 | 45–65 |
| Escarole | Apr 25 | May 30 | Jun 6 | Aug 1 – Aug 29 | 50–70 |
| Fava Beans | Apr 25 | May 30 | Jun 6 | Aug 22 – Oct 3 | 75–100 |
| Fennel | Apr 4 | Jun 20 | Jun 27 | Aug 29 – Oct 10 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Jun 20 | — | Aug 15 – Oct 10 | 50–65 |
| Horseradish | — | — | Jun 20 | Oct 24 – Nov 14 | 120–180 |
| Hubbard Squash | Apr 25 | Jun 20 | Jun 27 | Oct 10 – Nov 14 | 100–120 |
| Kabocha | Apr 25 | Jun 20 | Jun 27 | Sep 26 – Oct 24 | 85–100 |
| Kai Lan | Apr 25 | May 30 | Jun 6 | Jul 25 – Aug 22 | 45–60 |
| Kale | Apr 25 | May 30 | Jun 6 | Aug 1 – Sep 26 | 50–70 |
| Kidney Beans | — | Jun 20 | — | Sep 19 – Oct 24 | 85–110 |
| Kohlrabi | Apr 25 | May 30 | Jun 6 | Jul 25 – Aug 29 | 45–65 |
| Komatsuna | Apr 25 | May 30 | Jun 6 | Jul 11 – Aug 15 | 35–50 |
| Leeks | Apr 25 | May 30 | Jun 6 | Sep 5 – Oct 31 | 90–150 |
| Lentils | Apr 25 | May 30 | Jun 6 | Aug 29 – Oct 10 | 80–110 |
| Lettuce | Apr 25 | May 30 | Jun 6 | Jul 11 – Sep 19 | 30–60 |
| Lima Beans | — | Jun 20 | — | Aug 22 – Oct 3 | 60–90 |
| Mache | Apr 25 | May 30 | Jun 6 | Jul 18 – Aug 22 | 40–60 |
| Melon | Apr 25 | Jun 20 | Jun 27 | Sep 5 – Oct 24 | 70–100 |
| Microgreens | Apr 25 | May 30 | Jun 6 | Jun 13 – Jul 11 | 7–21 |
| Mitsuba | Apr 25 | May 30 | May 30 | Jul 25 – Sep 19 | 50–70 |
| Mizuna | Apr 25 | May 30 | Jun 6 | Jul 11 – Aug 8 | 30–45 |
| Mustard Greens | Apr 25 | May 30 | Jun 6 | Jul 11 – Sep 12 | 30–50 |
| Napa Cabbage | Apr 25 | May 30 | Jun 6 | Aug 1 – Sep 5 | 55–75 |
| Onion | Apr 25 | May 30 | Jun 6 | Sep 5 – Oct 24 | 90–120 |
| Pac Choi | Apr 25 | May 30 | Jun 6 | Jul 18 – Aug 15 | 40–55 |
| Parsnip | — | May 30 | — | Sep 12 – Oct 24 | 100–130 |
| Patty Pan Squash | Apr 25 | Jun 20 | Jun 27 | Aug 15 – Sep 12 | 45–60 |
| Peas | Apr 25 | May 30 | Jun 6 | Aug 1 – Sep 26 | 55–70 |
| Peppers | Mar 21 | Jun 20 | Jun 27 | Aug 29 – Nov 7 | 60–90 |
| Pole Beans | Apr 4 | Jun 20 | Jun 27 | Aug 22 – Oct 17 | 55–70 |
| Potatoes | Apr 4 | Jun 20 | Jun 27 | Sep 5 – Nov 14 | 70–120 |
| Pumpkin | Apr 25 | Jun 20 | Jun 27 | Sep 26 – Nov 14 | 85–120 |
| Purslane | Apr 25 | May 30 | Jun 6 | Jul 18 – Aug 22 | 40–60 |
| Radicchio | Apr 25 | May 30 | Jun 6 | Aug 8 – Sep 12 | 60–80 |
| Radish | — | May 30 | — | Jun 27 – Jul 18 | 22–35 |
| Rhubarb | — | — | Jul 4 | — | 365–730 |
| Romanesco | Apr 25 | May 30 | Jun 6 | Aug 22 – Oct 3 | 75–100 |
| Rutabaga | — | May 30 | — | Aug 22 – Sep 26 | 80–100 |
| Salsify | — | May 30 | — | Sep 12 – Oct 24 | 100–130 |
| Savoy Cabbage | Apr 25 | May 30 | Jun 6 | Aug 15 – Oct 10 | 70–110 |
| Scallions | Apr 25 | May 30 | Jun 6 | Aug 1 – Aug 29 | 50–70 |
| Scarlet Runner Beans | Apr 4 | Jun 20 | Jun 27 | Aug 29 – Oct 3 | 60–80 |
| Shallot | Apr 25 | May 30 | Jun 6 | Sep 5 – Oct 24 | 90–120 |
| Shiso | Apr 11 | Jun 13 | Jun 27 | Aug 22 – Oct 17 | 50–70 |
| Snap Peas | Apr 4 | Jun 20 | Jun 27 | Aug 22 – Oct 17 | 55–70 |
| Snow Peas | Apr 25 | May 30 | Jun 6 | Aug 1 – Sep 26 | 50–65 |
| Soybeans | — | Jun 20 | — | Sep 12 – Nov 7 | 80–120 |
| Spaghetti Squash | Apr 25 | Jun 20 | Jun 27 | Sep 26 – Oct 24 | 85–100 |
| Spinach | Apr 25 | May 30 | Jun 6 | Jul 11 – Sep 12 | 35–50 |
| Squash (Summer) | Apr 25 | Jun 20 | Jun 27 | Aug 15 – Oct 17 | 45–65 |
| Squash (Winter) | Apr 25 | Jun 20 | Jun 27 | Sep 19 – Nov 14 | 80–120 |
| Sunchoke | — | — | Jun 20 | Oct 10 – Nov 14 | 110–150 |
| Sunflower | Apr 4 | Jun 20 | Jun 27 | Sep 5 – Oct 24 | 70–100 |
| Sweet Corn | — | Jun 20 | — | Aug 22 – Oct 3 | 60–90 |
| Tatsoi | Apr 25 | May 30 | Jun 6 | Jul 11 – Aug 15 | 35–50 |
| Tomatillo | Apr 4 | Jun 20 | Jun 27 | Aug 29 – Nov 7 | 60–85 |
| Tomatoes | Apr 4 | Jun 20 | Jun 27 | Aug 29 – Nov 7 | 60–85 |
| Turnip | — | May 30 | — | Jul 11 – Aug 15 | 40–60 |
| Watercress | Apr 25 | May 30 | Jun 6 | Jul 18 – Aug 22 | 40–60 |
| Watermelon | Apr 25 | Jun 20 | Jun 27 | Sep 5 – Oct 24 | 70–100 |
| Wax Beans | — | Jun 20 | — | Aug 15 – Oct 10 | 50–65 |
| Zucchini | Apr 25 | Jun 20 | Jun 27 | Aug 15 – Oct 10 | 45–60 |
🍓 Fruits to Grow in Powell County
22 fruits that grow well in Zone 4b with planting dates for Powell County.
Show all 22 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jul 4 | Oct 3 – Nov 28 | 90–180 |
| Aronia | — | — | Jul 4 | — | 730–1095 |
| Blueberries | — | — | Jul 4 | — | 730–1095 |
| Cantaloupe | — | — | Jul 4 | Sep 12 – Oct 17 | 70–90 |
| Cranberries | — | — | Jul 4 | — | 730–1095 |
| Currants | — | — | Jul 4 | — | 730–1095 |
| Elderberries | — | — | Jul 4 | — | 730–1095 |
| Goji Berries | — | — | Jul 4 | — | 730–1095 |
| Gooseberries | — | — | Jul 4 | — | 730–1095 |
| Grapes | — | — | Jul 4 | — | 730–1095 |
| Ground Cherry | — | — | Jul 4 | Sep 12 – Nov 7 | 65–80 |
| Hardy Kiwi | — | — | Jul 4 | — | 1095–1825 |
| Haskaps | — | — | Jul 4 | — | 730–1095 |
| Honeydew | — | — | Jul 4 | Sep 26 – Nov 7 | 80–110 |
| Jostaberry | — | — | Jul 4 | — | 730–1095 |
| Lingonberries | — | — | Jul 4 | — | 730–1095 |
| Medlar | — | — | Jul 4 | — | 1095–1825 |
| Mulberries | — | — | Jul 4 | — | 730–1825 |
| Persimmon | — | — | Jul 4 | — | 1095–2555 |
| Raspberries | — | — | Jul 4 | — | 365–730 |
| Serviceberries | — | — | Jul 4 | — | 730–1095 |
| Strawberries | — | — | Jul 4 | Oct 3 – Nov 28 | 90–365 |
🌿 Herbs to Grow in Powell County
32 herbs that grow well in Zone 4b with planting dates for Powell County.
Show all 32 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 25 | May 30 | May 30 | — | 365–730 |
| Anise | Apr 25 | May 30 | May 30 | Aug 29 – Oct 24 | 90–120 |
| Basil | Apr 11 | Jun 13 | Jun 27 | Aug 22 – Oct 24 | 50–75 |
| Bee Balm | — | — | Jun 13 | Sep 12 – Nov 7 | 90–120 |
| Borage | Apr 25 | May 30 | May 30 | Jul 25 – Sep 12 | 50–60 |
| Caraway | Apr 25 | May 30 | May 30 | — | 365–450 |
| Catnip | — | — | Jun 13 | Aug 15 – Oct 17 | 60–80 |
| Chamomile | Apr 25 | May 30 | May 30 | Aug 1 – Oct 10 | 60–90 |
| Chervil | Apr 25 | May 30 | May 30 | Jul 11 – Sep 12 | 40–60 |
| Chives | — | — | Jun 13 | Aug 15 – Oct 24 | 60–90 |
| Cilantro | Apr 25 | May 30 | May 30 | Jul 11 – Sep 12 | 40–60 |
| Comfrey | — | — | Jun 13 | Aug 15 – Oct 24 | 60–90 |
| Dill | Apr 25 | May 30 | May 30 | Jul 11 – Sep 12 | 40–60 |
| Echinacea | — | — | Jun 13 | Oct 17 – Nov 7 | 120–180 |
| Fennel (herb) | Apr 25 | May 30 | May 30 | Aug 1 – Oct 10 | 60–90 |
| Garlic Chives | — | — | Jun 13 | Aug 15 – Oct 24 | 60–90 |
| Horehound | — | — | Jun 13 | Aug 29 – Oct 24 | 75–90 |
| Hyssop | — | — | Jun 13 | Aug 22 – Oct 24 | 70–90 |
| Lemon Balm | — | — | Jun 13 | Aug 15 – Oct 3 | 60–70 |
| Lovage | — | — | Jun 13 | Aug 22 – Oct 24 | 70–90 |
| Mint | — | — | Jun 13 | Aug 15 – Oct 24 | 60–90 |
| Oregano | — | — | Jun 13 | Aug 15 – Oct 24 | 60–90 |
| Parsley | Apr 25 | May 30 | May 30 | Aug 1 – Oct 3 | 60–80 |
| Rue | — | — | Jun 13 | Aug 22 – Oct 24 | 70–90 |
| Sage | — | — | Jun 13 | Aug 29 – Oct 24 | 75–90 |
| Savory | — | — | Jun 13 | Aug 8 – Oct 3 | 50–70 |
| Sorrel | Apr 25 | May 30 | May 30 | Jul 11 – Sep 12 | 40–60 |
| Tarragon | — | — | Jun 13 | Aug 15 – Oct 24 | 60–90 |
| Thai Basil | Apr 11 | Jun 13 | Jun 27 | Aug 22 – Oct 24 | 50–75 |
| Thyme | — | — | Jun 13 | Aug 22 – Oct 24 | 70–90 |
| Valerian | — | — | Jun 13 | Oct 17 – Nov 7 | 120–180 |
| Yarrow | — | — | Jun 13 | Sep 12 – Nov 7 | 90–120 |
Monthly Planting Guide for Powell County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Powell County.
Frequently Asked Questions
What planting zone is Powell County, MT?
Powell County is in USDA Hardiness Zone 4b. 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 Powell County, MT?
Based on 31 years of NOAA weather station data, the median last spring frost in Powell County falls around June 6. In 8 out of 10 years, last frost lands between May 11 and June 20 — a 40-day window of variability. Use June 20 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Powell County, MT?
The median first fall frost in Powell County arrives around September 8. In cold years it can arrive as early as August 18; in mild years as late as October 1. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Powell County?
Powell County has a frost-free growing season of approximately 94 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 7.57 days per decade.
What is the soil like in Powell County for gardening?
Powell County has predominantly Loam soil with a pH range of 6.5–8.2 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Powell County?
Powell County has commercial agriculture that includes Cattle, Hay, Wheat, Sugar Beets, Barley. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Powell County a good location for home gardening?
Powell County scores 36/100 (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 Powell County Garden Planner — Free
A 24-page printable planner built for Powell County (Zone 4b). 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