Fallon County, MT — Planting Guide
Fallon County is in USDA Zone 4a. The average last spring frost is May 20 and the first fall frost is September 20, giving you a growing season of approximately 123 days.
At an elevation of 6,441 ft, Fallon County receives approximately 19.8 in of rainfall annually. Summer highs average 81°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 29 days year to year — ranging from May 10 in warm years to June 8 in cold years. Fallon County scores 46/100 (Moderate) on the Microclimate Index.
🌡️ Zone
4a (-30°F to -25°F min)
❄️ Last Frost
May 20
🍂 First Frost
September 20
📅 Growing Season
123 days
⛰️ Elevation
6,441 ft
🌧️ Annual Rainfall
19.8 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 | 1.3 in | 7 days | — | None |
| Feb | 1.3 in | 5 days | — | None |
| Mar | 1.8 in | 9 days | — | None |
| Apr | 2.1 in | 8 days | 2.2 in | High |
| May | 2.7 in | 7 days | 1.6 in | High |
| Jun | 1.4 in | 5 days | 2.9 in | High |
| Jul | 1.6 in | 5 days | 2.7 in | High |
| Aug | 1.9 in | 6 days | 2.4 in | High |
| Sep | 1.6 in | 6 days | 2.7 in | High |
| Oct | 1.7 in | 5 days | 2.6 in | High |
| Nov | 1.2 in | 5 days | — | None |
| Dec | 1.2 in | 7 days | — | None |
Annual total: 19.8 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.
Fallon County Soil Profile
Soil Type
Loam
Soil pH
6.2-8.3
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 8 | Oct 4 | 118 days |
| Cautious | May 28 | Sep 22 | 117 days |
| Average year | May 20 | Sep 20 | 123 days |
| Optimistic | May 14 | Sep 13 | 122 days |
| Aggressive (risky) | May 10 | Sep 5 | 118 days |
Not very — frost dates can vary by ±29 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Slightly — seasons are trending a bit longer (0.5 days/decade). Historical frost dates are still reliable for planning.
Gardening Difficulty Score
Fallon County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Fallon 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 Fallon County's climate and soil.
County Extension Office
Fallon 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 Fallon County
Finding local nurseries & garden centers in Fallon County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Fallon 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 Fallon County MT" or "garden center Fallon 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 Fallon County MT" or check your extension office and local parks department. Facebook groups like "Fallon 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
8.4 hours
Winter solstice daylight
Peak Sun Hours
11.8 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 | 8.8 hr | 4.6 hr | Short day |
| February | 10.1 hr | 6.1 hr | Short day |
| March | 11.6 hr | 7.2 hr | Short day |
| April | 13.3 hr | 7.4 hr | Neutral |
| May | 14.8 hr | 9.1 hr | Long day |
| June | 15.6 hr | 11.8 hr | Long day |
| July | 15.3 hr | 10.6 hr | Long day |
| August | 14 hr | 9.7 hr | Long day |
| September | 12.3 hr | 8.9 hr | Neutral |
| October | 10.6 hr | 6.8 hr | Short day |
| November | 9.2 hr | 5.3 hr | Short day |
| December | 8.4 hr | 4.7 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 | -7°F | 5°F | ❄️ Dormant | ~36 weeks |
| Feb | -1°F | 2°F | ❄️ Dormant | ~36 weeks |
| Mar | 7°F | 11°F | ❄️ Dormant | ~36 weeks |
| Apr | 21°F | 21°F | ❄️ Dormant | ~36 weeks |
| May | 37°F | 31°F | ❄️ Dormant | ~36 weeks |
| Jun | 45°F | 41°F | 🐢 Slow | ~24 weeks |
| Jul | 51°F | 47°F | ♻️ Active | ~14 weeks |
| Aug | 53°F | 48°F | ♻️ Active | ~14 weeks |
| Sep | 45°F | 46°F | 🐢 Slow | ~24 weeks |
| Oct | 32°F | 35°F | ❄️ Dormant | ~36 weeks |
| Nov | 16°F | 23°F | ❄️ Dormant | ~36 weeks |
| Dec | 4°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 Fallon 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 | Low | 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 Fallon 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 | May 24 | Jul 19 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | Apr 25 | Jul 26 | ✓ 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 2 | Aug 23 | — | 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 | Aug 2 | Apr 29 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 8 | May 6 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 16 | May 6 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 11 | May 6 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 20 | Apr 29 | — | 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: 14 mph Summer: 12 mph
Fall: 13 mph Winter: 14 mph
Prevailing wind: W. Windy area — plant a windbreak hedge on the W side of your garden.
Windbreak Benefit
6.9/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
High
Hilly terrain with 2,920 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
9,868 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
Mar, Apr, May, 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 19.8 inches of rain per year
- A 1,000 sq ft roof can collect roughly 9,868 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 Fallon County
Soil Type
Loam
Soil pH 6.2–8.3 · 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
123-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.
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 Fallon County
96 vegetables that grow well in Zone 4a with planting dates for Fallon County.
Show all 96 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 8 | Jun 3 | Jun 10 | Sep 2 – Oct 7 | 80–100 |
| Amaranth | Mar 18 | Jun 3 | Jun 10 | Sep 9 – Oct 28 | 90–120 |
| Arugula | Apr 8 | May 13 | May 20 | Jun 24 – Aug 26 | 30–50 |
| Asparagus | — | — | Jun 3 | — | 730–1095 |
| Beets | — | May 13 | — | Jul 8 – Aug 5 | 50–70 |
| Belgian Endive | Apr 8 | May 13 | May 20 | Sep 9 – Oct 14 | 110–150 |
| Black Beans | — | Jun 3 | — | Sep 2 – Oct 21 | 90–120 |
| Bok Choy | Apr 8 | May 13 | May 20 | Jul 1 – Aug 5 | 40–60 |
| Broccoli | Apr 8 | May 13 | May 20 | Jul 22 – Sep 2 | 60–90 |
| Broccoli Rabe | Apr 8 | May 13 | May 20 | Jul 1 – Aug 5 | 40–60 |
| Brussels Sprouts | Apr 8 | May 13 | May 20 | Aug 19 – Oct 14 | 90–130 |
| Butternut Squash | Apr 8 | Jun 3 | Jun 10 | Sep 9 – Oct 14 | 85–110 |
| Cabbage | Apr 8 | May 13 | May 20 | Jul 22 – Sep 16 | 60–100 |
| Carrots | — | May 13 | — | Jul 15 – Aug 19 | 60–80 |
| Cauliflower | Apr 8 | May 13 | May 20 | Jul 15 – Sep 16 | 55–100 |
| Celeriac | Apr 8 | May 13 | May 20 | Sep 2 – Oct 7 | 100–120 |
| Celery | Apr 8 | May 13 | May 20 | Aug 12 – Oct 7 | 80–120 |
| Celtuce | Apr 8 | May 13 | May 20 | Jul 22 – Sep 2 | 60–90 |
| Chard | Apr 8 | May 13 | May 20 | Jul 15 – Sep 2 | 50–60 |
| Chickpeas | Apr 8 | May 13 | May 20 | Aug 12 – Sep 23 | 80–110 |
| Chicory | Apr 8 | May 13 | May 20 | Jul 22 – Sep 2 | 60–85 |
| Chinese Cabbage | Apr 8 | May 13 | May 20 | Jul 15 – Aug 12 | 50–70 |
| Christmas Lima Beans | Mar 18 | Jun 3 | Jun 10 | Sep 2 – Oct 7 | 80–100 |
| Collard Greens | Apr 8 | May 13 | May 20 | Jul 15 – Sep 16 | 55–75 |
| Corn | — | Jun 3 | — | Aug 5 – Sep 30 | 60–100 |
| Cress | Apr 8 | May 13 | May 20 | Jun 3 – Jun 24 | 14–21 |
| Crookneck Squash | Apr 8 | Jun 3 | Jun 10 | Jul 29 – Aug 26 | 45–60 |
| Crosne | — | May 13 | — | Oct 14 – Oct 7 | 150–200 |
| Cucumber | Apr 8 | Jun 3 | Jun 10 | Aug 5 – Sep 30 | 50–70 |
| Daikon | — | May 13 | — | Jul 8 – Aug 5 | 50–70 |
| Delicata Squash | Apr 8 | Jun 3 | Jun 10 | Sep 2 – Oct 7 | 80–100 |
| Edamame | — | Jun 3 | — | Aug 19 – Sep 30 | 75–100 |
| Endive | Apr 8 | May 13 | May 20 | Jul 8 – Aug 12 | 45–65 |
| Escarole | Apr 8 | May 13 | May 20 | Jul 15 – Aug 12 | 50–70 |
| Fava Beans | Apr 8 | May 13 | May 20 | Aug 5 – Sep 16 | 75–100 |
| Fennel | Mar 18 | Jun 3 | Jun 10 | Aug 12 – Sep 23 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Jun 3 | — | Jul 29 – Sep 23 | 50–65 |
| Horseradish | — | — | Jun 3 | Oct 7 – Oct 28 | 120–180 |
| Hubbard Squash | Apr 8 | Jun 3 | Jun 10 | Sep 23 – Oct 28 | 100–120 |
| Kabocha | Apr 8 | Jun 3 | Jun 10 | Sep 9 – Oct 7 | 85–100 |
| Kai Lan | Apr 8 | May 13 | May 20 | Jul 8 – Aug 5 | 45–60 |
| Kale | Apr 8 | May 13 | May 20 | Jul 15 – Sep 9 | 50–70 |
| Kidney Beans | — | Jun 3 | — | Sep 2 – Oct 7 | 85–110 |
| Kohlrabi | Apr 8 | May 13 | May 20 | Jul 8 – Aug 12 | 45–65 |
| Komatsuna | Apr 8 | May 13 | May 20 | Jun 24 – Jul 29 | 35–50 |
| Leeks | Apr 8 | May 13 | May 20 | Aug 19 – Oct 14 | 90–150 |
| Lentils | Apr 8 | May 13 | May 20 | Aug 12 – Sep 23 | 80–110 |
| Lettuce | Apr 8 | May 13 | May 20 | Jun 24 – Sep 2 | 30–60 |
| Lima Beans | — | Jun 3 | — | Aug 5 – Sep 16 | 60–90 |
| Mache | Apr 8 | May 13 | May 20 | Jul 1 – Aug 5 | 40–60 |
| Melon | Apr 8 | Jun 3 | Jun 10 | Aug 19 – Oct 7 | 70–100 |
| Microgreens | Apr 8 | May 13 | May 20 | May 27 – Jun 24 | 7–21 |
| Mitsuba | Apr 8 | May 13 | May 13 | Jul 8 – Sep 2 | 50–70 |
| Mizuna | Apr 8 | May 13 | May 20 | Jun 24 – Jul 22 | 30–45 |
| Mustard Greens | Apr 8 | May 13 | May 20 | Jun 24 – Aug 26 | 30–50 |
| Napa Cabbage | Apr 8 | May 13 | May 20 | Jul 15 – Aug 19 | 55–75 |
| Onion | Apr 8 | May 13 | May 20 | Aug 19 – Oct 7 | 90–120 |
| Pac Choi | Apr 8 | May 13 | May 20 | Jul 1 – Jul 29 | 40–55 |
| Parsnip | — | May 13 | — | Aug 26 – Oct 7 | 100–130 |
| Patty Pan Squash | Apr 8 | Jun 3 | Jun 10 | Jul 29 – Aug 26 | 45–60 |
| Peas | Apr 8 | May 13 | May 20 | Jul 15 – Sep 9 | 55–70 |
| Peppers | Mar 4 | Jun 3 | Jun 10 | Aug 12 – Oct 21 | 60–90 |
| Pole Beans | Mar 18 | Jun 3 | Jun 10 | Aug 5 – Sep 30 | 55–70 |
| Potatoes | Mar 18 | Jun 3 | Jun 10 | Aug 19 – Oct 28 | 70–120 |
| Pumpkin | Apr 8 | Jun 3 | Jun 10 | Sep 9 – Oct 28 | 85–120 |
| Purslane | Apr 8 | May 13 | May 20 | Jul 1 – Aug 5 | 40–60 |
| Radicchio | Apr 8 | May 13 | May 20 | Jul 22 – Aug 26 | 60–80 |
| Radish | — | May 13 | — | Jun 10 – Jul 1 | 22–35 |
| Rhubarb | — | — | Jun 17 | — | 365–730 |
| Romanesco | Apr 8 | May 13 | May 20 | Aug 5 – Sep 16 | 75–100 |
| Rutabaga | — | May 13 | — | Aug 5 – Sep 9 | 80–100 |
| Salsify | — | May 13 | — | Aug 26 – Oct 7 | 100–130 |
| Savoy Cabbage | Apr 8 | May 13 | May 20 | Jul 29 – Sep 23 | 70–110 |
| Scallions | Apr 8 | May 13 | May 20 | Jul 15 – Aug 12 | 50–70 |
| Scarlet Runner Beans | Mar 18 | Jun 3 | Jun 10 | Aug 12 – Sep 16 | 60–80 |
| Shallot | Apr 8 | May 13 | May 20 | Aug 19 – Oct 7 | 90–120 |
| Shiso | Mar 25 | May 27 | Jun 10 | Aug 5 – Sep 30 | 50–70 |
| Snap Peas | Mar 18 | Jun 3 | Jun 10 | Aug 5 – Sep 30 | 55–70 |
| Snow Peas | Apr 8 | May 13 | May 20 | Jul 15 – Sep 9 | 50–65 |
| Soybeans | — | Jun 3 | — | Aug 26 – Oct 21 | 80–120 |
| Spaghetti Squash | Apr 8 | Jun 3 | Jun 10 | Sep 9 – Oct 7 | 85–100 |
| Spinach | Apr 8 | May 13 | May 20 | Jun 24 – Aug 26 | 35–50 |
| Squash (Summer) | Apr 8 | Jun 3 | Jun 10 | Jul 29 – Sep 30 | 45–65 |
| Squash (Winter) | Apr 8 | Jun 3 | Jun 10 | Sep 2 – Oct 28 | 80–120 |
| Sunchoke | — | — | Jun 3 | Sep 23 – Oct 28 | 110–150 |
| Sunflower | Mar 18 | Jun 3 | Jun 10 | Aug 19 – Oct 7 | 70–100 |
| Sweet Corn | — | Jun 3 | — | Aug 5 – Sep 16 | 60–90 |
| Tatsoi | Apr 8 | May 13 | May 20 | Jun 24 – Jul 29 | 35–50 |
| Tomatillo | Mar 18 | Jun 3 | Jun 10 | Aug 12 – Oct 21 | 60–85 |
| Tomatoes | Mar 18 | Jun 3 | Jun 10 | Aug 12 – Oct 21 | 60–85 |
| Turnip | — | May 13 | — | Jun 24 – Jul 29 | 40–60 |
| Watercress | Apr 8 | May 13 | May 20 | Jul 1 – Aug 5 | 40–60 |
| Watermelon | Apr 8 | Jun 3 | Jun 10 | Aug 19 – Oct 7 | 70–100 |
| Wax Beans | — | Jun 3 | — | Jul 29 – Sep 23 | 50–65 |
| Zucchini | Apr 8 | Jun 3 | Jun 10 | Jul 29 – Sep 23 | 45–60 |
🍓 Fruits to Grow in Fallon County
22 fruits that grow well in Zone 4a with planting dates for Fallon County.
Show all 22 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 17 | Sep 16 – Nov 11 | 90–180 |
| Aronia | — | — | Jun 17 | — | 730–1095 |
| Blueberries | — | — | Jun 17 | — | 730–1095 |
| Cantaloupe | — | — | Jun 17 | Aug 26 – Sep 30 | 70–90 |
| Cranberries | — | — | Jun 17 | — | 730–1095 |
| Currants | — | — | Jun 17 | — | 730–1095 |
| Elderberries | — | — | Jun 17 | — | 730–1095 |
| Goji Berries | — | — | Jun 17 | — | 730–1095 |
| Gooseberries | — | — | Jun 17 | — | 730–1095 |
| Grapes | — | — | Jun 17 | — | 730–1095 |
| Ground Cherry | — | — | Jun 17 | Aug 26 – Oct 21 | 65–80 |
| Hardy Kiwi | — | — | Jun 17 | — | 1095–1825 |
| Haskaps | — | — | Jun 17 | — | 730–1095 |
| Honeydew | — | — | Jun 17 | Sep 9 – Oct 21 | 80–110 |
| Jostaberry | — | — | Jun 17 | — | 730–1095 |
| Lingonberries | — | — | Jun 17 | — | 730–1095 |
| Medlar | — | — | Jun 17 | — | 1095–1825 |
| Mulberries | — | — | Jun 17 | — | 730–1825 |
| Persimmon | — | — | Jun 17 | — | 1095–2555 |
| Raspberries | — | — | Jun 17 | — | 365–730 |
| Serviceberries | — | — | Jun 17 | — | 730–1095 |
| Strawberries | — | — | Jun 17 | Sep 16 – Nov 11 | 90–365 |
🌿 Herbs to Grow in Fallon County
32 herbs that grow well in Zone 4a with planting dates for Fallon County.
Show all 32 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 8 | May 13 | May 13 | — | 365–730 |
| Anise | Apr 8 | May 13 | May 13 | Aug 12 – Oct 7 | 90–120 |
| Basil | Mar 25 | May 27 | Jun 10 | Aug 5 – Oct 7 | 50–75 |
| Bee Balm | — | — | May 27 | Aug 26 – Oct 21 | 90–120 |
| Borage | Apr 8 | May 13 | May 13 | Jul 8 – Aug 26 | 50–60 |
| Caraway | Apr 8 | May 13 | May 13 | — | 365–450 |
| Catnip | — | — | May 27 | Jul 29 – Sep 30 | 60–80 |
| Chamomile | Apr 8 | May 13 | May 13 | Jul 15 – Sep 23 | 60–90 |
| Chervil | Apr 8 | May 13 | May 13 | Jun 24 – Aug 26 | 40–60 |
| Chives | — | — | May 27 | Jul 29 – Oct 7 | 60–90 |
| Cilantro | Apr 8 | May 13 | May 13 | Jun 24 – Aug 26 | 40–60 |
| Comfrey | — | — | May 27 | Jul 29 – Oct 7 | 60–90 |
| Dill | Apr 8 | May 13 | May 13 | Jun 24 – Aug 26 | 40–60 |
| Echinacea | — | — | May 27 | Sep 30 – Oct 21 | 120–180 |
| Fennel (herb) | Apr 8 | May 13 | May 13 | Jul 15 – Sep 23 | 60–90 |
| Garlic Chives | — | — | May 27 | Jul 29 – Oct 7 | 60–90 |
| Horehound | — | — | May 27 | Aug 12 – Oct 7 | 75–90 |
| Hyssop | — | — | May 27 | Aug 5 – Oct 7 | 70–90 |
| Lemon Balm | — | — | May 27 | Jul 29 – Sep 16 | 60–70 |
| Lovage | — | — | May 27 | Aug 5 – Oct 7 | 70–90 |
| Mint | — | — | May 27 | Jul 29 – Oct 7 | 60–90 |
| Oregano | — | — | May 27 | Jul 29 – Oct 7 | 60–90 |
| Parsley | Apr 8 | May 13 | May 13 | Jul 15 – Sep 16 | 60–80 |
| Rue | — | — | May 27 | Aug 5 – Oct 7 | 70–90 |
| Sage | — | — | May 27 | Aug 12 – Oct 7 | 75–90 |
| Savory | — | — | May 27 | Jul 22 – Sep 16 | 50–70 |
| Sorrel | Apr 8 | May 13 | May 13 | Jun 24 – Aug 26 | 40–60 |
| Tarragon | — | — | May 27 | Jul 29 – Oct 7 | 60–90 |
| Thai Basil | Mar 25 | May 27 | Jun 10 | Aug 5 – Oct 7 | 50–75 |
| Thyme | — | — | May 27 | Aug 5 – Oct 7 | 70–90 |
| Valerian | — | — | May 27 | Sep 30 – Oct 21 | 120–180 |
| Yarrow | — | — | May 27 | Aug 26 – Oct 21 | 90–120 |
Monthly Planting Guide for Fallon County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Fallon County.
Frequently Asked Questions
What planting zone is Fallon County, MT?
Fallon County is in USDA Hardiness Zone 4a. 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 Fallon County, MT?
Based on 31 years of NOAA weather station data, the median last spring frost in Fallon County falls around May 20. In 8 out of 10 years, last frost lands between May 10 and June 8 — a 29-day window of variability. Use June 8 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Fallon County, MT?
The median first fall frost in Fallon County arrives around September 20. In cold years it can arrive as early as September 5; in mild years as late as October 4. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Fallon County?
Fallon County has a frost-free growing season of approximately 123 days. Focus on short-season varieties and start warm-season crops indoors 6–8 weeks before last frost.
What is the soil like in Fallon County for gardening?
Fallon County has predominantly Loam soil with a pH range of 6.2–8.3 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Fallon County?
Fallon County has commercial agriculture that includes Cattle, Wheat, Hay. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Fallon County a good location for home gardening?
Fallon County scores 46/100 (Moderate) 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 Fallon County gardeners in Zone 4a 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.
