When to plant tomato in Wyoming
Wyoming spans USDA zones 4a–5b, so the right time to plant tomato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 17 in Casper to June 27 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 21 – May 28 |
| Casper | 5a | May 10 | September 29 | May 17 – May 24 |
| Gillette | 4b | May 15 | October 1 | May 22 – May 29 |
| Laramie | 4a | June 7 | September 4 | June 14 – June 21 |
| Rock Springs | 5a | May 24 | September 24 | May 31 – June 7 |
| Sheridan | 5a | May 21 | September 23 | May 28 – June 4 |
| Evanston | 5a | June 12 | September 12 | June 19 – June 26 |
| Green River | 5a | May 24 | September 22 | May 31 – June 7 |
Tomato in Wyoming: FAQ
When can I plant tomato in Wyoming?
Across Wyoming, the time to transplant tomato spans roughly May 17 in Casper to June 27 in Jackson, each following that city's local frost dates.
Does the tomato planting date vary across Wyoming?
Yes. Wyoming publishes 11 cities with their own frost dates, so the right tomato planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does tomato take to grow in Wyoming?
Tomato takes about 60–85 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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