When to plant sorrel in Colorado
Colorado spans USDA zones 5b–7a, so the right time to plant sorrel 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 18 |
| Colorado Springs | 6a | May 3 | October 8 | April 5 – May 17 |
| Aurora | 6a | May 7 | October 8 | April 9 – May 21 |
| Fort Collins | 5b | May 2 | October 7 | April 4 – May 16 |
| Lakewood | 6a | May 3 | October 7 | April 5 – May 17 |
| Thornton | 6a | May 2 | October 11 | April 4 – May 16 |
| Arvada | 6a | May 5 | October 5 | April 7 – May 19 |
| Westminster | 6a | May 2 | October 11 | April 4 – May 16 |
Sorrel in Colorado: FAQ
When can I plant sorrel in Colorado?
Across Colorado, the time to direct-sow sorrel spans roughly March 17 in Grand Junction to May 24 in Edwards, each following that city's local frost dates.
Does the sorrel planting date vary across Colorado?
Yes. Colorado publishes 70 cities with their own frost dates, so the right sorrel 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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