Sanders County, MT — Planting Guide
May in the garden — Sanders County, Montana
Welcome to May in Zone 6a. These are the moves that will have the biggest impact on your growing season.
-
Get kale, lettuce, and angelica in the ground
Plant tomatoes deep — bury the stem up to the first true leaves to grow extra roots. Everything else goes in at the same depth it grew in the tray.
-
Plant basil, carrots, and cucumber from seed, right in the garden
Mark the row. Birds and stray feet both have opinions about unmarked beds.
-
Harvest microgreens as they ripen
Morning harvests are best — cooler temperatures mean crisper produce and longer fridge life.
June will be here before you know it — start on
- Transplants going out: basil, cucumber, and peppers
- Starting indoors: cucumber, kale, and lettuce
- First harvests: lettuce, radish, and arugula
Sanders County is in USDA Zone 6a. The average last spring frost is May 24 and the first fall frost is September 13, giving you a growing season of approximately 112 days.
At an elevation of 5,775 ft, Sanders County receives approximately 16.4 in of rainfall annually. Summer highs average 87°F with winter lows around 18°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 56 days year to year — ranging from May 1 in warm years to June 27 in cold years. The growing season is trending longer by about 10.63 days per decade. Sanders County scores 28/100 (Challenging) on the Microclimate Index.
🌡️ Zone
6a (°F to °F min)
❄️ Last Frost
May 24
🍂 First Frost
September 13
📅 Growing Season
112 days
⛰️ Elevation
5,775 ft
🌧️ Annual Rainfall
16.4 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 | 1.1 in | 6 days | — | None |
| Feb | 1 in | 6 days | — | None |
| Mar | 1.3 in | 7 days | — | None |
| Apr | 1.7 in | 7 days | 2.6 in | High |
| May | 1.8 in | 9 days | 2.5 in | High |
| Jun | 1.3 in | 4 days | 3 in | High |
| Jul | 1.5 in | 6 days | 2.8 in | High |
| Aug | 1.7 in | 7 days | 2.6 in | High |
| Sep | 1.4 in | 6 days | 2.9 in | High |
| Oct | 1.4 in | 5 days | 2.9 in | High |
| Nov | 1.2 in | 6 days | — | None |
| Dec | 1 in | 7 days | — | None |
Annual total: 16.4 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.
Sanders County Soil Profile
Soil Type
Loam
Soil pH
6.3-7.9
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 27 | Oct 11 | 106 days |
| Cautious | Jun 18 | Sep 30 | 104 days |
| Average year | May 24 | Sep 13 | 112 days |
| Optimistic | May 12 | Aug 22 | 102 days |
| Aggressive (risky) | May 1 | Aug 2 | 93 days |
Not very — frost dates can vary by ±56 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 10.6 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Sanders County has challenging growing conditions. Season extension and careful variety selection are essential.
Local Gardening Help in Sanders 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 Sanders County's climate and soil.
County Extension Office
Sanders 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 Sanders County
Finding local nurseries & garden centers in Sanders County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Sanders 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 Sanders County MT" or "garden center Sanders 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 Sanders County MT" or check your extension office and local parks department. Facebook groups like "Sanders 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
15.8 hours
Summer solstice daylight
Shortest Day
8.2 hours
Winter solstice daylight
Peak Sun Hours
11 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 8.6 hr | 4.6 hr | Short day |
| February | 10 hr | 5.7 hr | Short day |
| March | 11.6 hr | 6.9 hr | Short day |
| April | 13.4 hr | 8 hr | Neutral |
| May | 14.9 hr | 8.8 hr | Long day |
| June | 15.8 hr | 11 hr | Long day |
| July | 15.4 hr | 10.5 hr | Long day |
| August | 14.1 hr | 9.3 hr | Long day |
| September | 12.3 hr | 8.3 hr | Neutral |
| October | 10.6 hr | 7.2 hr | Short day |
| November | 9 hr | 5.4 hr | Short day |
| December | 8.2 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
Jun
Microbial activity peaks when soil is warm.
Active Composting
4 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 | 4°F | 13°F | ❄️ Dormant | ~36 weeks |
| Feb | 6°F | 13°F | ❄️ Dormant | ~36 weeks |
| Mar | 13°F | 16°F | ❄️ Dormant | ~36 weeks |
| Apr | 27°F | 26°F | ❄️ Dormant | ~36 weeks |
| May | 39°F | 39°F | ❄️ Dormant | ~36 weeks |
| Jun | 53°F | 46°F | ♻️ Active | ~14 weeks |
| Jul | 59°F | 54°F | ♻️ Active | ~14 weeks |
| Aug | 59°F | 57°F | ♻️ Active | ~14 weeks |
| Sep | 53°F | 52°F | ♻️ Active | ~14 weeks |
| Oct | 39°F | 42°F | ❄️ Dormant | ~36 weeks |
| Nov | 26°F | 32°F | ❄️ Dormant | ~36 weeks |
| Dec | 13°F | 21°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 Sanders 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 |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
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 Sanders 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 | Jun 1 | Jul 5 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Jun 2 | Jul 12 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 27 | 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 | Jun 15 | Aug 30 | — | 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 17 | May 3 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Jul 24 | May 10 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jun 27 | May 10 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 7 | May 3 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 19 | May 3 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 24 | May 10 | — | 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: 11 mph
Fall: 12 mph Winter: 16 mph
Prevailing wind: W. Windy area — plant a windbreak hedge on the W side of your garden.
Windbreak Benefit
6.6/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
High
Hilly terrain with 1,166 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
8,173 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 2,000 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
Jan, Feb, 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 16.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 8,173 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 Sanders County
Soil Type
Loam
Soil pH 6.3–7.9 · 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
112-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 Sanders County
108 vegetables that grow well in Zone 6a with planting dates for Sanders County.
Show all 108 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 19 | May 31 | Jun 7 | Aug 30 – Oct 4 | 80–100 |
| Amaranth | Mar 29 | May 31 | Jun 7 | Sep 6 – Oct 25 | 90–120 |
| Arugula | Apr 19 | May 10 | May 24 | Jun 28 – Aug 30 | 30–50 |
| Asparagus | — | — | Jun 7 | — | 730–1095 |
| Beets | — | May 10 | — | Jul 5 – Aug 2 | 50–70 |
| Belgian Endive | Apr 19 | May 10 | May 24 | Sep 13 – Nov 8 | 110–150 |
| Bitter Melon | Mar 29 | May 31 | Jun 7 | Aug 9 – Sep 20 | 60–90 |
| Black Beans | — | May 31 | — | Aug 30 – Oct 18 | 90–120 |
| Bok Choy | Apr 19 | May 10 | May 24 | Jul 5 – Aug 9 | 40–60 |
| Broccoli | Apr 19 | May 10 | May 24 | Jul 26 – Sep 6 | 60–90 |
| Broccoli Rabe | Apr 19 | May 10 | May 24 | Jul 5 – Aug 9 | 40–60 |
| Brussels Sprouts | Apr 19 | May 10 | May 24 | Aug 23 – Oct 18 | 90–130 |
| Butternut Squash | Apr 19 | May 31 | Jun 7 | Sep 6 – Oct 11 | 85–110 |
| Cabbage | Apr 19 | May 10 | May 24 | Jul 26 – Sep 20 | 60–100 |
| Calabash | Mar 29 | May 31 | Jun 7 | Aug 30 – Oct 25 | 80–120 |
| Carrots | — | May 10 | — | Jul 12 – Aug 16 | 60–80 |
| Cauliflower | Apr 19 | May 10 | May 24 | Jul 19 – Sep 20 | 55–100 |
| Celeriac | Apr 19 | May 10 | May 24 | Sep 6 – Oct 11 | 100–120 |
| Celery | Apr 19 | May 10 | May 24 | Aug 16 – Oct 11 | 80–120 |
| Celtuce | Apr 19 | May 10 | May 24 | Jul 26 – Sep 6 | 60–90 |
| Chard | Apr 19 | May 10 | May 24 | Jul 19 – Sep 6 | 50–60 |
| Chickpeas | Apr 19 | May 10 | May 24 | Aug 16 – Sep 27 | 80–110 |
| Chicory | Apr 19 | May 10 | May 24 | Jul 26 – Sep 6 | 60–85 |
| Chinese Cabbage | Apr 19 | May 10 | May 24 | Jul 19 – Aug 16 | 50–70 |
| Christmas Lima Beans | Mar 29 | May 31 | Jun 7 | Aug 30 – Oct 4 | 80–100 |
| Collard Greens | Apr 19 | May 10 | May 24 | Jul 19 – Sep 20 | 55–75 |
| Corn | — | May 31 | — | Aug 2 – Sep 27 | 60–100 |
| Cowpeas | — | May 31 | — | Aug 2 – Sep 13 | 60–90 |
| Cress | Apr 19 | May 10 | May 24 | Jun 7 – Jun 28 | 14–21 |
| Crookneck Squash | Apr 19 | May 31 | Jun 7 | Jul 26 – Aug 23 | 45–60 |
| Crosne | — | May 10 | — | Oct 11 – Nov 22 | 150–200 |
| Cucumber | Apr 19 | May 31 | Jun 7 | Aug 2 – Sep 27 | 50–70 |
| Daikon | — | May 10 | — | Jul 5 – Aug 2 | 50–70 |
| Delicata Squash | Apr 19 | May 31 | Jun 7 | Aug 30 – Oct 4 | 80–100 |
| Edamame | — | May 31 | — | Aug 16 – Sep 27 | 75–100 |
| Eggplant | Mar 15 | May 31 | Jun 7 | Aug 16 – Oct 18 | 65–85 |
| Endive | Apr 19 | May 10 | May 24 | Jul 12 – Aug 16 | 45–65 |
| Escarole | Apr 19 | May 10 | May 24 | Jul 19 – Aug 16 | 50–70 |
| Fava Beans | Apr 19 | May 10 | May 24 | Aug 9 – Sep 20 | 75–100 |
| Fennel | Mar 29 | May 31 | Jun 7 | Aug 9 – Sep 20 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 31 | — | Jul 26 – Sep 20 | 50–65 |
| Horseradish | — | — | Jun 7 | Oct 11 – Dec 20 | 120–180 |
| Hot Peppers | Mar 15 | May 31 | Jun 7 | Aug 16 – Nov 22 | 70–120 |
| Hubbard Squash | Apr 19 | May 31 | Jun 7 | Sep 20 – Oct 25 | 100–120 |
| Kabocha | Apr 19 | May 31 | Jun 7 | Sep 6 – Oct 4 | 85–100 |
| Kai Lan | Apr 19 | May 10 | May 24 | Jul 12 – Aug 9 | 45–60 |
| Kale | Apr 19 | May 10 | May 24 | Jul 19 – Sep 13 | 50–70 |
| Kidney Beans | — | May 31 | — | Aug 30 – Oct 4 | 85–110 |
| Kohlrabi | Apr 19 | May 10 | May 24 | Jul 12 – Aug 16 | 45–65 |
| Komatsuna | Apr 19 | May 10 | May 24 | Jun 28 – Aug 2 | 35–50 |
| Leeks | Apr 19 | May 10 | May 24 | Aug 23 – Nov 8 | 90–150 |
| Lentils | Apr 19 | May 10 | May 24 | Aug 16 – Sep 27 | 80–110 |
| Lettuce | Apr 19 | May 10 | May 24 | Jun 28 – Sep 6 | 30–60 |
| Lima Beans | — | May 31 | — | Aug 2 – Sep 13 | 60–90 |
| Loofah | Mar 29 | May 31 | Jun 7 | Sep 20 – Nov 22 | 100–150 |
| Luffa | Mar 29 | May 31 | Jun 7 | Sep 6 – Nov 22 | 90–150 |
| Mache | Apr 19 | May 10 | May 24 | Jul 5 – Aug 9 | 40–60 |
| Melon | Apr 19 | May 31 | Jun 7 | Aug 16 – Oct 4 | 70–100 |
| Microgreens | Apr 19 | May 10 | May 24 | May 31 – Jun 28 | 7–21 |
| Mitsuba | Apr 19 | May 10 | May 17 | Jul 12 – Sep 6 | 50–70 |
| Mizuna | Apr 19 | May 10 | May 24 | Jun 28 – Jul 26 | 30–45 |
| Mustard Greens | Apr 19 | May 10 | May 24 | Jun 28 – Aug 30 | 30–50 |
| Napa Cabbage | Apr 19 | May 10 | May 24 | Jul 19 – Aug 23 | 55–75 |
| New Zealand Spinach | Mar 29 | May 31 | Jun 7 | Aug 2 – Aug 30 | 55–70 |
| Okra | Mar 29 | May 31 | Jun 7 | Aug 2 – Sep 27 | 50–65 |
| Onion | Apr 19 | May 10 | May 24 | Aug 23 – Oct 11 | 90–120 |
| Pac Choi | Apr 19 | May 10 | May 24 | Jul 5 – Aug 2 | 40–55 |
| Parsnip | — | May 10 | — | Aug 23 – Oct 4 | 100–130 |
| Patty Pan Squash | Apr 19 | May 31 | Jun 7 | Jul 26 – Aug 23 | 45–60 |
| Peas | Apr 19 | May 10 | May 24 | Jul 19 – Sep 13 | 55–70 |
| Peppers | Mar 15 | May 31 | Jun 7 | Aug 9 – Oct 18 | 60–90 |
| Pole Beans | Mar 29 | May 31 | Jun 7 | Aug 2 – Sep 27 | 55–70 |
| Potatoes | Mar 29 | May 31 | Jun 7 | Aug 16 – Oct 25 | 70–120 |
| Pumpkin | Apr 19 | May 31 | Jun 7 | Sep 6 – Oct 25 | 85–120 |
| Purslane | Apr 19 | May 10 | May 24 | Jul 5 – Aug 9 | 40–60 |
| Radicchio | Apr 19 | May 10 | May 24 | Jul 26 – Aug 30 | 60–80 |
| Radish | — | May 10 | — | Jun 7 – Jun 28 | 22–35 |
| Rhubarb | — | — | Jun 14 | — | 365–730 |
| Romanesco | Apr 19 | May 10 | May 24 | Aug 9 – Sep 20 | 75–100 |
| Rutabaga | — | May 10 | — | Aug 2 – Sep 6 | 80–100 |
| Salsify | — | May 10 | — | Aug 23 – Oct 4 | 100–130 |
| Savoy Cabbage | Apr 19 | May 10 | May 24 | Aug 2 – Sep 27 | 70–110 |
| Scallions | Apr 19 | May 10 | May 24 | Jul 19 – Aug 16 | 50–70 |
| Scarlet Runner Beans | Mar 29 | May 31 | Jun 7 | Aug 9 – Sep 13 | 60–80 |
| Shallot | Apr 19 | May 10 | May 24 | Aug 23 – Oct 11 | 90–120 |
| Shiso | Apr 5 | May 31 | Jun 7 | Aug 2 – Sep 27 | 50–70 |
| Snap Peas | Mar 29 | May 31 | Jun 7 | Aug 2 – Sep 27 | 55–70 |
| Snow Peas | Apr 19 | May 10 | May 24 | Jul 19 – Sep 13 | 50–65 |
| Soybeans | — | May 31 | — | Aug 23 – Oct 18 | 80–120 |
| Spaghetti Squash | Apr 19 | May 31 | Jun 7 | Sep 6 – Oct 4 | 85–100 |
| Spinach | Apr 19 | May 10 | May 24 | Jun 28 – Aug 30 | 35–50 |
| Squash (Summer) | Apr 19 | May 31 | Jun 7 | Jul 26 – Sep 27 | 45–65 |
| Squash (Winter) | Apr 19 | May 31 | Jun 7 | Aug 30 – Oct 25 | 80–120 |
| Sunchoke | — | — | Jun 7 | Sep 27 – Nov 22 | 110–150 |
| Sunflower | Mar 29 | May 31 | Jun 7 | Aug 16 – Oct 4 | 70–100 |
| Sweet Corn | — | May 31 | — | Aug 2 – Sep 13 | 60–90 |
| Sweet Potatoes | Mar 29 | May 31 | Jun 7 | Sep 6 – Oct 25 | 90–120 |
| Tatsoi | Apr 19 | May 10 | May 24 | Jun 28 – Aug 2 | 35–50 |
| Tomatillo | Mar 29 | May 31 | Jun 7 | Aug 9 – Oct 18 | 60–85 |
| Tomatoes | Mar 29 | May 31 | Jun 7 | Aug 9 – Oct 18 | 60–85 |
| Turnip | — | May 10 | — | Jun 21 – Jul 26 | 40–60 |
| Watercress | Apr 19 | May 10 | May 24 | Jul 5 – Aug 9 | 40–60 |
| Watermelon | Apr 19 | May 31 | Jun 7 | Aug 16 – Oct 4 | 70–100 |
| Wax Beans | — | May 31 | — | Jul 26 – Sep 20 | 50–65 |
| Winter Melon | Mar 29 | May 31 | Jun 7 | Sep 6 – Oct 25 | 90–120 |
| Yard Long Beans | Mar 29 | May 31 | Jun 7 | Aug 2 – Sep 13 | 55–80 |
| Zucchini | Apr 19 | May 31 | Jun 7 | Jul 26 – Sep 20 | 45–60 |
🍓 Fruits to Grow in Sanders County
27 fruits that grow well in Zone 6a with planting dates for Sanders County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 14 | Sep 13 – Dec 27 | 90–180 |
| Aronia | — | — | Jun 14 | — | 730–1095 |
| Blackberries | — | — | Jun 14 | — | 365–730 |
| Blueberries | — | — | Jun 14 | — | 730–1095 |
| Boysenberries | — | — | Jun 14 | — | 365–730 |
| Cantaloupe | — | — | Jun 14 | Aug 23 – Sep 27 | 70–90 |
| Che Fruit | — | — | Jun 14 | — | 1095–1825 |
| Cranberries | — | — | Jun 14 | — | 730–1095 |
| Currants | — | — | Jun 14 | — | 730–1095 |
| Elderberries | — | — | Jun 14 | — | 730–1095 |
| Goji Berries | — | — | Jun 14 | — | 730–1095 |
| Gooseberries | — | — | Jun 14 | — | 730–1095 |
| Grapes | — | — | Jun 14 | — | 730–1095 |
| Ground Cherry | — | — | Jun 14 | Aug 23 – Oct 18 | 65–80 |
| Hardy Kiwi | — | — | Jun 14 | — | 1095–1825 |
| Haskaps | — | — | Jun 14 | — | 730–1095 |
| Honeydew | — | — | Jun 14 | Sep 6 – Oct 18 | 80–110 |
| Jostaberry | — | — | Jun 14 | — | 730–1095 |
| Lingonberries | — | — | Jun 14 | — | 730–1095 |
| Medlar | — | — | Jun 14 | — | 1095–1825 |
| Mulberries | — | — | Jun 14 | — | 730–1825 |
| Pawpaw | — | — | Jun 14 | — | 1095–2555 |
| Persimmon | — | — | Jun 14 | — | 1095–2555 |
| Quince | — | — | Jun 14 | — | 1095–1825 |
| Raspberries | — | — | Jun 14 | — | 365–730 |
| Serviceberries | — | — | Jun 14 | — | 730–1095 |
| Strawberries | — | — | Jun 14 | Sep 13 – Dec 27 | 90–365 |
🌿 Herbs to Grow in Sanders County
38 herbs that grow well in Zone 6a with planting dates for Sanders County.
Show all 38 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 19 | May 10 | May 17 | — | 365–730 |
| Anise | Apr 19 | May 10 | May 17 | Aug 16 – Nov 1 | 90–120 |
| Basil | Apr 5 | May 31 | Jun 7 | Aug 2 – Oct 4 | 50–75 |
| Bee Balm | — | — | May 31 | Aug 30 – Nov 15 | 90–120 |
| Borage | Apr 19 | May 10 | May 17 | Jul 12 – Aug 30 | 50–60 |
| Caraway | Apr 19 | May 10 | May 17 | — | 365–450 |
| Catnip | — | — | May 31 | Aug 2 – Oct 4 | 60–80 |
| Chamomile | Apr 19 | May 10 | May 17 | Jul 19 – Sep 27 | 60–90 |
| Chervil | Apr 19 | May 10 | May 17 | Jun 28 – Aug 30 | 40–60 |
| Chives | — | — | May 31 | Aug 2 – Oct 11 | 60–90 |
| Cilantro | Apr 19 | May 10 | May 17 | Jun 28 – Aug 30 | 40–60 |
| Comfrey | — | — | May 31 | Aug 2 – Oct 11 | 60–90 |
| Cumin | Apr 19 | May 10 | May 17 | Aug 30 – Nov 1 | 100–120 |
| Dill | Apr 19 | May 10 | May 17 | Jun 28 – Aug 30 | 40–60 |
| Echinacea | — | — | May 31 | Oct 4 – Dec 13 | 120–180 |
| Epazote | Apr 5 | May 31 | Jun 7 | Jul 26 – Sep 20 | 45–60 |
| Fennel (herb) | Apr 19 | May 10 | May 17 | Jul 19 – Sep 27 | 60–90 |
| Feverfew | — | — | May 31 | Aug 30 – Nov 15 | 90–120 |
| Garlic Chives | — | — | May 31 | Aug 2 – Oct 11 | 60–90 |
| Horehound | — | — | May 31 | Aug 16 – Oct 11 | 75–90 |
| Hyssop | — | — | May 31 | Aug 9 – Oct 11 | 70–90 |
| Lavender | — | — | May 31 | Aug 30 – Dec 13 | 90–200 |
| Lemon Balm | — | — | May 31 | Aug 2 – Sep 20 | 60–70 |
| Lemon Thyme | — | — | May 31 | Aug 9 – Oct 11 | 70–90 |
| Lovage | — | — | May 31 | Aug 9 – Oct 11 | 70–90 |
| Marjoram | — | — | May 31 | Aug 2 – Oct 11 | 60–90 |
| Mint | — | — | May 31 | Aug 2 – Oct 11 | 60–90 |
| Oregano | — | — | May 31 | Aug 2 – Oct 11 | 60–90 |
| Parsley | Apr 19 | May 10 | May 17 | Jul 19 – Sep 20 | 60–80 |
| Rue | — | — | May 31 | Aug 9 – Oct 11 | 70–90 |
| Sage | — | — | May 31 | Aug 16 – Oct 11 | 75–90 |
| Savory | — | — | May 31 | Jul 26 – Sep 20 | 50–70 |
| Sorrel | Apr 19 | May 10 | May 17 | Jun 28 – Aug 30 | 40–60 |
| Tarragon | — | — | May 31 | Aug 2 – Oct 11 | 60–90 |
| Thai Basil | Apr 5 | May 31 | Jun 7 | Aug 2 – Oct 4 | 50–75 |
| Thyme | — | — | May 31 | Aug 9 – Oct 11 | 70–90 |
| Valerian | — | — | May 31 | Oct 4 – Dec 13 | 120–180 |
| Yarrow | — | — | May 31 | Aug 30 – Nov 15 | 90–120 |
Monthly Planting Guide for Sanders County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Sanders County.
Frequently Asked Questions
What planting zone is Sanders County, MT?
Sanders County is in USDA Hardiness Zone 6a. This zone classification determines which perennial plants survive winter and sets the baseline for frost timing across the county.
When is the last frost in Sanders County, MT?
Based on 31 years of NOAA weather station data, the median last spring frost in Sanders County falls around May 24. In 8 out of 10 years, last frost lands between May 1 and June 27 — a 56-day window of variability. Use June 27 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Sanders County, MT?
The median first fall frost in Sanders County arrives around September 13. In cold years it can arrive as early as August 2; in mild years as late as October 11. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Sanders County?
Sanders County has a frost-free growing season of approximately 112 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 10.63 days per decade.
What is the soil like in Sanders County for gardening?
Sanders County has predominantly Loam soil with a pH range of 6.3–7.9 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Sanders County?
Sanders County has commercial agriculture that includes Cattle, Hay, Wheat. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Sanders County a good location for home gardening?
Sanders County scores 28/100 (Challenging) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Gardening here benefits from close attention to frost timing and season extension due to the challenging microclimate factors.
Your Sanders County Garden Planner — Free
A 24-page printable planner built for Sanders County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log