When to plant rhubarb in Idaho
Idaho spans USDA zones 5a–7a, so the right time to plant rhubarb shifts by weeks across the state. The window to transplant seedlings outdoors runs from about February 23 in Lewiston to April 5 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 | March 13 – April 10 |
| Meridian | 7a | April 24 | October 21 | March 13 – April 10 |
| Nampa | 7a | April 29 | October 13 | March 18 – April 15 |
| Idaho Falls | 5b | May 9 | October 1 | March 28 – April 25 |
| Caldwell | 7a | April 29 | October 13 | March 18 – April 15 |
| Pocatello | 6a | May 2 | October 11 | March 21 – April 18 |
| Coeur d'Alene | 6b | April 22 | October 18 | March 11 – April 8 |
| Twin Falls | 7a | April 30 | October 9 | March 19 – April 16 |
Rhubarb in Idaho: FAQ
When can I plant rhubarb in Idaho?
Across Idaho, the time to transplant rhubarb spans roughly February 23 in Lewiston to April 5 in Garden City, each following that city's local frost dates.
Does the rhubarb planting date vary across Idaho?
Yes. Idaho publishes 25 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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