Frost dates by location
| Location | Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Casper | 5a | May 26 | Sep 22 | 119 |
| Cheyenne | 5b | May 17 | Sep 27 | 133 |
| Gillette | 5a | May 20 | Sep 26 | 129 |
Zones in Wyoming
Bottom line: a statewide planting date is a compromise nobody's garden actually
lives at. Wyoming's last-frost spread is
9 days wide. Use the location nearest you.
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