When to plant chervil in Idaho
Idaho spans USDA zones 5a–7a, so the right time to plant chervil shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 9 in Lewiston to April 19 in Garden City — below are local dates for 25 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Boise City | 7a | April 24 | October 21 | March 27 – April 24 |
| Meridian | 7a | April 24 | October 21 | March 27 – April 24 |
| Nampa | 7a | April 29 | October 13 | April 1 – April 29 |
| Idaho Falls | 5b | May 9 | October 1 | April 11 – May 9 |
| Caldwell | 7a | April 29 | October 13 | April 1 – April 29 |
| Pocatello | 6a | May 2 | October 11 | April 4 – May 2 |
| Coeur d'Alene | 6b | April 22 | October 18 | March 25 – April 22 |
| Twin Falls | 7a | April 30 | October 9 | April 2 – April 30 |
Chervil in Idaho: FAQ
When can I plant chervil in Idaho?
Across Idaho, the time to direct-sow chervil spans roughly March 9 in Lewiston to April 19 in Garden City, each following that city's local frost dates.
Does the chervil planting date vary across Idaho?
Yes. Idaho publishes 25 cities with their own frost dates, so the right chervil 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 chervil take to grow in Idaho?
Chervil takes about 55–70 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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