When to plant chervil in Montana
Montana spans USDA zones 4b–5b, so the right time to plant chervil shifts by weeks across the state. The window to sow seed directly outdoors runs from about April 6 in Billings to May 16 in Butte-Silver Bow — below are local dates for 8 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Billings | 5a | May 4 | October 7 | April 6 – May 4 |
| Missoula | 5b | May 10 | October 1 | April 12 – May 10 |
| Great Falls | 4b | May 6 | October 1 | April 8 – May 6 |
| Bozeman | 5a | May 26 | September 22 | April 28 – May 26 |
| Butte-Silver Bow | 5a | June 13 | September 5 | May 16 – June 13 |
| Helena | 5a | May 9 | September 30 | April 11 – May 9 |
| Kalispell | 5b | May 31 | September 10 | May 3 – May 31 |
| Belgrade | 5a | May 26 | September 16 | April 28 – May 26 |
Chervil in Montana: FAQ
When can I plant chervil in Montana?
Across Montana, the time to direct-sow chervil spans roughly April 6 in Billings to May 16 in Butte-Silver Bow, each following that city's local frost dates.
Does the chervil planting date vary across Montana?
Yes. Montana publishes 8 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 Montana?
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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