Frost dates in Wyoming
Average last frost dates in Wyoming run from May 10 in Casper to June 20 in Jackson.
| Place | Last frost | First frost |
|---|---|---|
| Casper | May 10 | Sept 29 |
| Cheyenne | May 14 | Oct 1 |
| Cody | May 12 | Oct 1 |
| Evanston | June 12 | Sept 12 |
| Gillette | May 15 | Oct 1 |
| Green River | May 24 | Sept 22 |
| Jackson | June 20 | Aug 31 |
| Laramie | June 7 | Sept 4 |
| Riverton | May 12 | Sept 24 |
| Rock Springs | May 24 | Sept 24 |
| Sheridan | May 21 | Sept 23 |
Source: NOAA U.S. Climate Normals 1991–2020, nearest station to each place. Places of 10,000+ people (US Census Bureau, 2024 estimates) within 50 miles of a station.
When to plant in Wyoming
Updated