When to plant mint in Wyoming
Wyoming spans USDA zones 4a–5b, so the right time to plant mint shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 10 in Casper to June 20 in Jackson — below are local dates for 11 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Cheyenne | 5b | May 14 | October 1 | May 14 – May 28 |
| Casper | 5a | May 10 | September 29 | May 10 – May 24 |
| Gillette | 4b | May 15 | October 1 | May 15 – May 29 |
| Laramie | 4a | June 7 | September 4 | June 7 – June 21 |
| Rock Springs | 5a | May 24 | September 24 | May 24 – June 7 |
| Sheridan | 5a | May 21 | September 23 | May 21 – June 4 |
| Evanston | 5a | June 12 | September 12 | June 12 – June 26 |
| Green River | 5a | May 24 | September 22 | May 24 – June 7 |
Mint in Wyoming: FAQ
When can I plant mint in Wyoming?
Across Wyoming, the time to transplant mint spans roughly May 10 in Casper to June 20 in Jackson, each following that city's local frost dates.
Does the mint planting date vary across Wyoming?
Yes. Wyoming publishes 11 cities with their own frost dates, so the right mint planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
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