When to plant chervil in Colorado
Colorado spans USDA zones 5b–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 17 in Grand Junction to May 24 in Edwards — below are local dates for 70 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Denver | 6a | May 4 | October 8 | April 6 – May 4 |
| Colorado Springs | 6a | May 3 | October 8 | April 5 – May 3 |
| Aurora | 6a | May 7 | October 8 | April 9 – May 7 |
| Fort Collins | 5b | May 2 | October 7 | April 4 – May 2 |
| Lakewood | 6a | May 3 | October 7 | April 5 – May 3 |
| Thornton | 6a | May 2 | October 11 | April 4 – May 2 |
| Arvada | 6a | May 5 | October 5 | April 7 – May 5 |
| Westminster | 6a | May 2 | October 11 | April 4 – May 2 |
Chervil in Colorado: FAQ
When can I plant chervil in Colorado?
Across Colorado, the time to direct-sow chervil spans roughly March 17 in Grand Junction to May 24 in Edwards, each following that city's local frost dates.
Does the chervil planting date vary across Colorado?
Yes. Colorado publishes 70 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 Colorado?
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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