State growing guide
Wyoming Planting Guide
USDA Zone 4a/4b · Last frost May 22 · First frost Sep 12 · 113 days
Zone-specific planting calendar, major city frost dates, top crops, and Duke's tips for growing food in Wyoming.
Frost Dates by City — Wyoming
Average frost dates for major Wyoming cities. Use these to calculate your indoor start dates and transplant windows.
| City | USDA Zone | Last Spring Frost | First Fall Frost | Tomato Transplant Window |
|---|---|---|---|---|
| Cheyenne | 4b | May 20 | Sep 15 | ~2 wks after (May 20) |
| Casper | 4a | May 25 | Sep 10 | ~2 wks after (May 25) |
| Laramie | 4a | May 28 | Sep 5 | ~2 wks after (May 28) |
| Sheridan | 5a | May 15 | Sep 25 | ~2 wks after (May 15) |
| Rock Springs | 4a | May 25 | Sep 10 | ~2 wks after (May 25) |
Average dates based on 30-year NOAA climate normals. Individual years may vary ±2 weeks. Use the Zone Lookup Tool for ZIP-specific dates.
Duke's Top Tips for Wyoming Gardeners
- Wyoming has one of the shortest growing seasons in the US
- Use season extenders (hoop tunnels, row covers) extensively
- Choose varieties under 60 days for warm-season crops
- Greenhouses are commonly used by Wyoming gardeners for tomatoes and peppers
Common Challenges in Wyoming
- ⚠ Extremely short growing season (90–120 days)
- ⚠ Frost is possible every month at high elevations
- ⚠ High altitude means intense UV and rapid soil drying
Best Crops for Wyoming
Potatoes Wheat Barley Short-Season Beans Kale Peas Carrots Beets
Get exact dates for your ZIP code in Wyoming
City averages are a starting point. Your actual microclimate matters — enter your ZIP for precise frost dates.
Frequently Asked Questions — Wyoming Gardening
What zone is Wyoming?
Wyoming ranges from Zone 3a (high mountain areas) to Zone 5b (lower elevation valleys). Cheyenne is Zone 4b, Casper is Zone 4a, and Sheridan in the north is Zone 5a.