When to plant sweet potato in Idaho
Idaho spans USDA zones 5a–7a, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 27 in Lewiston to June 7 in Garden City — below are local dates for 25 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Boise City | 7a | April 24 | October 21 | May 15 – May 29 |
| Meridian | 7a | April 24 | October 21 | May 15 – May 29 |
| Nampa | 7a | April 29 | October 13 | May 20 – June 3 |
| Idaho Falls | 5b | May 9 | October 1 | May 30 – June 13 |
| Caldwell | 7a | April 29 | October 13 | May 20 – June 3 |
| Pocatello | 6a | May 2 | October 11 | May 23 – June 6 |
| Coeur d'Alene | 6b | April 22 | October 18 | May 13 – May 27 |
| Twin Falls | 7a | April 30 | October 9 | May 21 – June 4 |
Sweet Potato in Idaho: FAQ
When can I plant sweet potato in Idaho?
Across Idaho, the time to transplant sweet potato spans roughly April 27 in Lewiston to June 7 in Garden City, each following that city's local frost dates.
Does the sweet potato planting date vary across Idaho?
Yes. Idaho publishes 25 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 Idaho?
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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