When to plant sweet potato in Wyoming
Wyoming spans USDA zones 4a–5b, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 31 in Casper to July 11 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 | June 4 – June 18 |
| Casper | 5a | May 10 | September 29 | May 31 – June 14 |
| Gillette | 4b | May 15 | October 1 | June 5 – June 19 |
| Laramie | 4a | June 7 | September 4 | June 28 – July 12 |
| Rock Springs | 5a | May 24 | September 24 | June 14 – June 28 |
| Sheridan | 5a | May 21 | September 23 | June 11 – June 25 |
| Evanston | 5a | June 12 | September 12 | July 3 – July 17 |
| Green River | 5a | May 24 | September 22 | June 14 – June 28 |
Sweet Potato in Wyoming: FAQ
When can I plant sweet potato in Wyoming?
Across Wyoming, the time to transplant sweet potato spans roughly May 31 in Casper to July 11 in Jackson, each following that city's local frost dates.
Does the sweet potato planting date vary across Wyoming?
Yes. Wyoming publishes 11 cities with their own frost dates, so the right sweet potato 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 sweet potato take to grow in Wyoming?
Sweet Potato takes about 90–120 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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