Wyoming Planting Guide & Growing Season
Wyoming is in USDA hardiness zone 3a-5b with a growing season of 110 days. The average last spring frost is May 25 and the average first fall frost is Sep 10.
Growing Conditions in Wyoming
How Wyoming Compares
Compare Wyoming's growing conditions with states that have similar climates.
| State | USDA Zone | Last Frost | First Frost | Season (days) |
|---|---|---|---|---|
| Wyoming (WY) | 3a-5b | May 25 | Sep 10 | 110 |
| Alabama (AL) | 7a-8b | Mar 15 | Nov 5 | 235 |
| Alaska (AK) | 1a-7b | May 30 | Sep 5 | 100 |
| Arizona (AZ) | 4b-10b | Mar 1 | Nov 15 | 260 |
| Arkansas (AR) | 6b-8a | Apr 1 | Oct 25 | 210 |
| California (CA) | 4b-11a | Feb 15 | Nov 30 | 290 |
Frequently Asked Questions About Gardening in Wyoming
When should I start seeds indoors in Wyoming?
In Wyoming, the average last frost date is May 25. Start most seeds indoors 6-8 weeks before this date. The USDA hardiness zone for Wyoming is 3a-5b, with a growing season of approximately 110 days.
What USDA hardiness zone is Wyoming?
Wyoming falls in USDA hardiness zones 3a-5b. This affects which perennial plants will survive winter and influences optimal planting times.
When is the first frost in Wyoming?
The average first frost date in Wyoming is Sep 10. Plan to harvest cold-sensitive crops before this date or protect them with row covers.
How long is the growing season in Wyoming?
Wyoming has an average growing season of 110 days, from the last frost (May 25) to first frost (Sep 10). This shorter season requires starting many crops indoors and choosing quick-maturing varieties.
Plan Your Garden
Use our seed starting calculator to get personalized planting dates, or browse all states.