Frost dates across Wyoming
Typical last spring frost, first fall frost, and USDA zone for 10 Wyoming cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any Wyoming ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Cheyenne | May 14 | Oct 1 | about 140 days | 5b |
| Casper | May 10 | Sep 29 | about 142 days | 5a |
| Gillette | May 15 | Oct 1 | about 139 days | 5a |
| Laramie | Jun 7 | Sep 4 | about 89 days | 4b |
| Rock Springs | May 24 | Sep 24 | about 123 days | 5b |
| Sheridan | May 21 | Sep 23 | about 125 days | 5a |
| Evanston | Jun 12 | Sep 12 | about 92 days | 5a |
| Jackson | Jun 20 | Aug 31 | about 72 days | 4b |
| Riverton | May 12 | Sep 24 | about 135 days | 5a |
| Cody | May 12 | Oct 1 | about 142 days | 5a |
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