Wyoming Frost Dates
Across Wyoming, the average last spring frost ranges from May 10 in Casper to Jun 20 in Jackson. Find your town below, or enter your ZIP code for the nearest station.
Largest cities
Average frost dates in Wyoming towns
Average (50%) dates of the last 32°F frost in spring and the first in fall, from the nearest NOAA station. Towns with 5,000+ residents.
| Town | Last frost | First frost | Season (days) |
|---|---|---|---|
| Casper | May 10 | Sep 29 | 138 |
| Cheyenne | May 14 | Oct 1 | 139 |
| Cody | May 12 | Oct 1 | 140 |
| Douglas | May 19 | Sep 23 | 126 |
| Evanston | Jun 12 | Sep 12 | 90 |
| Gillette | May 15 | Oct 1 | 136 |
| Green River | May 24 | Sep 22 | 120 |
| Jackson | Jun 20 | Aug 31 | 70 |
| Lander | May 18 | Sep 27 | 131 |
| Laramie | Jun 7 | Sep 4 | 88 |
| Powell | May 19 | Sep 20 | 123 |
| Rawlins | May 17 | Oct 2 | 138 |
| Riverton | May 12 | Sep 24 | 132 |
| Rock Springs | May 24 | Sep 24 | 121 |
| Sheridan | May 21 | Sep 23 | 123 |
| Torrington | May 11 | Sep 29 | 139 |