When to plant rhubarb in Wyoming
Wyoming spans USDA zones 4a–5b, so the right time to plant rhubarb shifts by weeks across the state. The window to transplant seedlings outdoors runs from about March 29 in Casper to May 9 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 | April 2 – April 30 |
| Casper | 5a | May 10 | September 29 | March 29 – April 26 |
| Gillette | 4b | May 15 | October 1 | April 3 – May 1 |
| Laramie | 4a | June 7 | September 4 | April 26 – May 24 |
| Rock Springs | 5a | May 24 | September 24 | April 12 – May 10 |
| Sheridan | 5a | May 21 | September 23 | April 9 – May 7 |
| Evanston | 5a | June 12 | September 12 | May 1 – May 29 |
| Green River | 5a | May 24 | September 22 | April 12 – May 10 |
Rhubarb in Wyoming: FAQ
When can I plant rhubarb in Wyoming?
Across Wyoming, the time to transplant rhubarb spans roughly March 29 in Casper to May 9 in Jackson, each following that city's local frost dates.
Does the rhubarb planting date vary across Wyoming?
Yes. Wyoming publishes 11 cities with their own frost dates, so the right rhubarb 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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