Sublette County, WY — Planting Guide
Sublette County is in USDA Zone 3b. The average last spring frost is June 22 and the first fall frost is August 24, giving you a growing season of approximately 63 days.
At an elevation of 5,005 ft, Sublette County receives approximately 22.8 in of rainfall annually. Summer highs average 81°F with winter lows around -3°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 20 days year to year — ranging from June 9 in warm years to June 30 in cold years. The growing season is trending longer by about 1.65 days per decade. Sublette County scores 47/100 (Moderate) on the Microclimate Index.
🌡️ Zone
3b (-35°F to -30°F min)
❄️ Last Frost
June 22
🍂 First Frost
August 24
📅 Growing Season
63 days
⛰️ Elevation
5,005 ft
🌧️ Annual Rainfall
22.8 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 | 1.8 in | 6 days | — | None |
| Feb | 1.5 in | 5 days | — | None |
| Mar | 2.1 in | 7 days | — | None |
| Apr | 2.6 in | 8 days | — | None |
| May | 2.5 in | 7 days | 1.8 in | High |
| Jun | 1.5 in | 5 days | 2.8 in | High |
| Jul | 2.2 in | 6 days | 2.1 in | High |
| Aug | 2.1 in | 6 days | 2.2 in | High |
| Sep | 1.7 in | 5 days | 2.6 in | High |
| Oct | 2 in | 5 days | — | None |
| Nov | 1.4 in | 5 days | — | None |
| Dec | 1.4 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.
Sublette County Soil Profile
Soil Type
Loam
Soil pH
6.7-7.8
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 30 | Sep 16 | 78 days |
| Cautious | Jun 28 | Sep 2 | 66 days |
| Average year | Jun 22 | Aug 24 | 63 days |
| Optimistic | Jun 17 | Aug 8 | 52 days |
| Aggressive (risky) | Jun 9 | Aug 1 | 53 days |
Moderately predictable (±20 day range). The "Cautious" dates in the table below are a safe bet.
Yes — growing seasons are getting longer here (about 1.7 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Sublette County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Sublette 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 Sublette County's climate and soil.
County Extension Office
Sublette County University of Wyoming Extension Extension Office
Phone: 307-766-5124
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 Sublette County
Finding local nurseries & garden centers in Sublette County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Sublette 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 Sublette County WY" or "garden center Sublette 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 Sublette County WY" or check your extension office and local parks department. Facebook groups like "Sublette County Gardeners" or "Wyoming Gardening" are also excellent for local advice and plant swaps.
Sunlight & Day Length
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
15.1 hours
Summer solstice daylight
Shortest Day
8.9 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 | 9.2 hr | 5.2 hr | Short day |
| February | 10.3 hr | 5.9 hr | Short day |
| March | 11.7 hr | 7.2 hr | Short day |
| April | 13.2 hr | 7.3 hr | Neutral |
| May | 14.4 hr | 9.1 hr | Long day |
| June | 15.1 hr | 10.8 hr | Long day |
| July | 14.9 hr | 10.8 hr | Long day |
| August | 13.7 hr | 9.5 hr | Neutral |
| September | 12.3 hr | 8.5 hr | Neutral |
| October | 10.8 hr | 6.8 hr | Short day |
| November | 9.5 hr | 5.4 hr | Short day |
| December | 8.9 hr | 5.1 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 | -5°F | 3°F | ❄️ Dormant | ~36 weeks |
| Feb | -4°F | 1°F | ❄️ Dormant | ~36 weeks |
| Mar | 7°F | 9°F | ❄️ Dormant | ~36 weeks |
| Apr | 24°F | 21°F | ❄️ Dormant | ~36 weeks |
| May | 36°F | 31°F | ❄️ Dormant | ~36 weeks |
| Jun | 47°F | 43°F | 🐢 Slow | ~24 weeks |
| Jul | 57°F | 49°F | ♻️ Active | ~14 weeks |
| Aug | 54°F | 50°F | ♻️ Active | ~14 weeks |
| Sep | 46°F | 45°F | 🐢 Slow | ~24 weeks |
| Oct | 33°F | 36°F | ❄️ Dormant | ~36 weeks |
| Nov | 16°F | 24°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 Sublette 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 4 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | Jun, Jul, Aug |
| Cabbage worms | Low | Jun, Jul, Aug |
| Flea beetles | Low | May, Jun, Jul |
| Slugs | 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 Sublette 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 28 | Jun 15 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | May 22 | Jun 22 | ✓ 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 | Jul 4 | Aug 10 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (3 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Oats | Jul 15 | Jun 8 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 4 | Jun 1 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | May 15 | Jun 8 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 16 mph Summer: 11 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
7.2/10
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 1,779 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
Mar, Apr, May, Jul
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jun, 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 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 (Jun, Nov, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Sublette County
Soil Type
Loam
Soil pH 6.7–7.8 · Moderately 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
63-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 Sublette County
87 vegetables that grow well in Zone 3b with planting dates for Sublette County.
Show all 87 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | May 11 | Jul 6 | Jul 13 | Oct 5 – Nov 9 | 80–100 |
| Amaranth | Apr 20 | Jul 6 | Jul 13 | Oct 12 – Nov 16 | 90–120 |
| Arugula | May 11 | Jun 15 | Jun 22 | Jul 27 – Sep 28 | 30–50 |
| Asparagus | — | — | Jul 6 | — | 730–1095 |
| Beets | — | Jun 15 | — | Aug 10 – Sep 7 | 50–70 |
| Belgian Endive | May 11 | Jun 15 | Jun 22 | Oct 12 – Oct 26 | 110–150 |
| Black Beans | — | Jul 6 | — | Oct 5 – Nov 9 | 90–120 |
| Bok Choy | May 11 | Jun 15 | Jun 22 | Aug 3 – Sep 7 | 40–60 |
| Broccoli | May 11 | Jun 15 | Jun 22 | Aug 24 – Oct 5 | 60–90 |
| Broccoli Rabe | May 11 | Jun 15 | Jun 22 | Aug 3 – Sep 7 | 40–60 |
| Brussels Sprouts | May 11 | Jun 15 | Jun 22 | Sep 21 – Oct 26 | 90–130 |
| Butternut Squash | May 11 | Jul 6 | Jul 13 | Oct 12 – Nov 16 | 85–110 |
| Cabbage | May 11 | Jun 15 | Jun 22 | Aug 24 – Oct 19 | 60–100 |
| Carrots | — | Jun 15 | — | Aug 17 – Sep 21 | 60–80 |
| Cauliflower | May 11 | Jun 15 | Jun 22 | Aug 17 – Oct 19 | 55–100 |
| Celeriac | May 11 | Jun 15 | Jun 22 | Oct 5 – Oct 26 | 100–120 |
| Celery | May 11 | Jun 15 | Jun 22 | Sep 14 – Oct 26 | 80–120 |
| Celtuce | May 11 | Jun 15 | Jun 22 | Aug 24 – Oct 5 | 60–90 |
| Chard | May 11 | Jun 15 | Jun 22 | Aug 17 – Oct 5 | 50–60 |
| Chickpeas | May 11 | Jun 15 | Jun 22 | Sep 14 – Oct 26 | 80–110 |
| Chicory | May 11 | Jun 15 | Jun 22 | Aug 24 – Oct 5 | 60–85 |
| Chinese Cabbage | May 11 | Jun 15 | Jun 22 | Aug 17 – Sep 14 | 50–70 |
| Collard Greens | May 11 | Jun 15 | Jun 22 | Aug 17 – Oct 19 | 55–75 |
| Corn | — | Jul 6 | — | Sep 7 – Nov 2 | 60–100 |
| Cress | May 11 | Jun 15 | Jun 22 | Jul 6 – Jul 27 | 14–21 |
| Crookneck Squash | May 11 | Jul 6 | Jul 13 | Aug 31 – Sep 28 | 45–60 |
| Cucumber | May 11 | Jul 6 | Jul 13 | Sep 7 – Nov 2 | 50–70 |
| Daikon | — | Jun 15 | — | Aug 10 – Sep 7 | 50–70 |
| Delicata Squash | May 11 | Jul 6 | Jul 13 | Oct 5 – Nov 9 | 80–100 |
| Edamame | — | Jul 6 | — | Sep 21 – Nov 2 | 75–100 |
| Endive | May 11 | Jun 15 | Jun 22 | Aug 10 – Sep 14 | 45–65 |
| Escarole | May 11 | Jun 15 | Jun 22 | Aug 17 – Sep 14 | 50–70 |
| Fava Beans | May 11 | Jun 15 | Jun 22 | Sep 7 – Oct 19 | 75–100 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Jul 6 | — | Aug 31 – Oct 26 | 50–65 |
| Horseradish | — | — | Jul 6 | Nov 9 | 120–180 |
| Hubbard Squash | May 11 | Jul 6 | Jul 13 | Oct 26 – Nov 16 | 100–120 |
| Kabocha | May 11 | Jul 6 | Jul 13 | Oct 12 – Nov 9 | 85–100 |
| Kai Lan | May 11 | Jun 15 | Jun 22 | Aug 10 – Sep 7 | 45–60 |
| Kale | May 11 | Jun 15 | Jun 22 | Aug 17 – Oct 12 | 50–70 |
| Kidney Beans | — | Jul 6 | — | Oct 5 – Nov 9 | 85–110 |
| Kohlrabi | May 11 | Jun 15 | Jun 22 | Aug 10 – Sep 14 | 45–65 |
| Komatsuna | May 11 | Jun 15 | Jun 22 | Jul 27 – Aug 31 | 35–50 |
| Leeks | May 11 | Jun 15 | Jun 22 | Sep 21 – Oct 26 | 90–150 |
| Lentils | May 11 | Jun 15 | Jun 22 | Sep 14 – Oct 26 | 80–110 |
| Lettuce | May 11 | Jun 15 | Jun 22 | Jul 27 – Oct 5 | 30–60 |
| Lima Beans | — | Jul 6 | — | Sep 7 – Oct 19 | 60–90 |
| Mache | May 11 | Jun 15 | Jun 22 | Aug 3 – Sep 7 | 40–60 |
| Microgreens | May 11 | Jun 15 | Jun 22 | Jun 29 – Jul 27 | 7–21 |
| Mizuna | May 11 | Jun 15 | Jun 22 | Jul 27 – Aug 24 | 30–45 |
| Mustard Greens | May 11 | Jun 15 | Jun 22 | Jul 27 – Sep 28 | 30–50 |
| Napa Cabbage | May 11 | Jun 15 | Jun 22 | Aug 17 – Sep 21 | 55–75 |
| Onion | May 11 | Jun 15 | Jun 22 | Sep 21 – Oct 26 | 90–120 |
| Pac Choi | May 11 | Jun 15 | Jun 22 | Aug 3 – Aug 31 | 40–55 |
| Parsnip | — | Jun 15 | — | Sep 28 – Oct 19 | 100–130 |
| Patty Pan Squash | May 11 | Jul 6 | Jul 13 | Aug 31 – Sep 28 | 45–60 |
| Peas | May 11 | Jun 15 | Jun 22 | Aug 17 – Oct 12 | 55–70 |
| Peppers | Apr 6 | Jul 6 | Jul 13 | Sep 14 – Nov 16 | 60–90 |
| Pole Beans | Apr 20 | Jul 6 | Jul 13 | Sep 7 – Nov 2 | 55–70 |
| Potatoes | Apr 20 | Jul 6 | Jul 13 | Sep 21 – Nov 16 | 70–120 |
| Pumpkin | May 11 | Jul 6 | Jul 13 | Oct 12 – Nov 16 | 85–120 |
| Purslane | May 11 | Jun 15 | Jun 22 | Aug 3 – Sep 7 | 40–60 |
| Radish | — | Jun 15 | — | Jul 13 – Aug 3 | 22–35 |
| Rhubarb | — | — | Jul 20 | — | 365–730 |
| Romanesco | May 11 | Jun 15 | Jun 22 | Sep 7 – Oct 19 | 75–100 |
| Rutabaga | — | Jun 15 | — | Sep 7 – Oct 12 | 80–100 |
| Salsify | — | Jun 15 | — | Sep 28 – Oct 19 | 100–130 |
| Savoy Cabbage | May 11 | Jun 15 | Jun 22 | Aug 31 – Oct 26 | 70–110 |
| Scallions | May 11 | Jun 15 | Jun 22 | Aug 17 – Sep 14 | 50–70 |
| Scarlet Runner Beans | Apr 20 | Jul 6 | Jul 13 | Sep 14 – Oct 19 | 60–80 |
| Shiso | Apr 27 | Jun 29 | Jul 13 | Sep 7 – Nov 2 | 50–70 |
| Snap Peas | Apr 20 | Jul 6 | Jul 13 | Sep 7 – Nov 2 | 55–70 |
| Snow Peas | May 11 | Jun 15 | Jun 22 | Aug 17 – Oct 12 | 50–65 |
| Soybeans | — | Jul 6 | — | Sep 28 – Nov 9 | 80–120 |
| Spaghetti Squash | May 11 | Jul 6 | Jul 13 | Oct 12 – Nov 9 | 85–100 |
| Spinach | May 11 | Jun 15 | Jun 22 | Jul 27 – Sep 28 | 35–50 |
| Squash (Summer) | May 11 | Jul 6 | Jul 13 | Aug 31 – Nov 2 | 45–65 |
| Squash (Winter) | May 11 | Jul 6 | Jul 13 | Oct 5 – Nov 16 | 80–120 |
| Sunchoke | — | — | Jul 6 | Oct 26 – Nov 9 | 110–150 |
| Sunflower | Apr 20 | Jul 6 | Jul 13 | Sep 21 – Nov 9 | 70–100 |
| Sweet Corn | — | Jul 6 | — | Sep 7 – Oct 19 | 60–90 |
| Tatsoi | May 11 | Jun 15 | Jun 22 | Jul 27 – Aug 31 | 35–50 |
| Tomatoes | Apr 20 | Jul 6 | Jul 13 | Sep 14 – Nov 16 | 60–85 |
| Turnip | — | Jun 15 | — | Jul 27 – Aug 31 | 40–60 |
| Watercress | May 11 | Jun 15 | Jun 22 | Aug 3 – Sep 7 | 40–60 |
| Wax Beans | — | Jul 6 | — | Aug 31 – Oct 26 | 50–65 |
| Zucchini | May 11 | Jul 6 | Jul 13 | Aug 31 – Oct 26 | 45–60 |
🍓 Fruits to Grow in Sublette County
15 fruits that grow well in Zone 3b with planting dates for Sublette County.
Show all 15 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jul 20 | Oct 19 – Nov 23 | 90–180 |
| Aronia | — | — | Jul 20 | — | 730–1095 |
| Blueberries | — | — | Jul 20 | — | 730–1095 |
| Cranberries | — | — | Jul 20 | — | 730–1095 |
| Currants | — | — | Jul 20 | — | 730–1095 |
| Elderberries | — | — | Jul 20 | — | 730–1095 |
| Goji Berries | — | — | Jul 20 | — | 730–1095 |
| Gooseberries | — | — | Jul 20 | — | 730–1095 |
| Hardy Kiwi | — | — | Jul 20 | — | 1095–1825 |
| Haskaps | — | — | Jul 20 | — | 730–1095 |
| Jostaberry | — | — | Jul 20 | — | 730–1095 |
| Lingonberries | — | — | Jul 20 | — | 730–1095 |
| Raspberries | — | — | Jul 20 | — | 365–730 |
| Serviceberries | — | — | Jul 20 | — | 730–1095 |
| Strawberries | — | — | Jul 20 | Oct 19 – Nov 23 | 90–365 |
🌿 Herbs to Grow in Sublette County
22 herbs that grow well in Zone 3b with planting dates for Sublette County.
Show all 22 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | May 11 | Jun 15 | Jun 15 | — | 365–730 |
| Bee Balm | — | — | Jun 29 | Sep 28 – Nov 2 | 90–120 |
| Borage | May 11 | Jun 15 | Jun 15 | Aug 10 – Sep 28 | 50–60 |
| Caraway | May 11 | Jun 15 | Jun 15 | — | 365–450 |
| Catnip | — | — | Jun 29 | Aug 31 – Nov 2 | 60–80 |
| Chamomile | May 11 | Jun 15 | Jun 15 | Aug 17 – Oct 19 | 60–90 |
| Chervil | May 11 | Jun 15 | Jun 15 | Jul 27 – Sep 28 | 40–60 |
| Chives | — | — | Jun 29 | Aug 31 – Nov 2 | 60–90 |
| Cilantro | May 11 | Jun 15 | Jun 15 | Jul 27 – Sep 28 | 40–60 |
| Comfrey | — | — | Jun 29 | Aug 31 – Nov 2 | 60–90 |
| Dill | May 11 | Jun 15 | Jun 15 | Jul 27 – Sep 28 | 40–60 |
| Echinacea | — | — | Jun 29 | Nov 2 | 120–180 |
| Garlic Chives | — | — | Jun 29 | Aug 31 – Nov 2 | 60–90 |
| Horehound | — | — | Jun 29 | Sep 14 – Nov 2 | 75–90 |
| Hyssop | — | — | Jun 29 | Sep 7 – Nov 2 | 70–90 |
| Lemon Balm | — | — | Jun 29 | Aug 31 – Oct 19 | 60–70 |
| Lovage | — | — | Jun 29 | Sep 7 – Nov 2 | 70–90 |
| Mint | — | — | Jun 29 | Aug 31 – Nov 2 | 60–90 |
| Parsley | May 11 | Jun 15 | Jun 15 | Aug 17 – Oct 19 | 60–80 |
| Sorrel | May 11 | Jun 15 | Jun 15 | Jul 27 – Sep 28 | 40–60 |
| Valerian | — | — | Jun 29 | Nov 2 | 120–180 |
| Yarrow | — | — | Jun 29 | Sep 28 – Nov 2 | 90–120 |
Monthly Planting Guide for Sublette County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Sublette County.
Frequently Asked Questions
What planting zone is Sublette County, WY?
Sublette County is in USDA Hardiness Zone 3b. 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 Sublette County, WY?
Based on 31 years of NOAA weather station data, the median last spring frost in Sublette County falls around June 22. In 8 out of 10 years, last frost lands between June 9 and June 30 — a 20-day window of variability. Use June 30 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Sublette County, WY?
The median first fall frost in Sublette County arrives around August 24. In cold years it can arrive as early as August 1; in mild years as late as September 16. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Sublette County?
Sublette County has a frost-free growing season of approximately 63 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 1.65 days per decade.
What is the soil like in Sublette County for gardening?
Sublette County has predominantly Loam soil with a pH range of 6.7–7.8 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Sublette County?
Sublette County has commercial agriculture that includes Hay, Cattle, Wheat. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Sublette County a good location for home gardening?
Sublette County scores 47/100 (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 Sublette County gardeners in Zone 3b 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.
