Frost dates across Colorado
Typical last spring frost, first fall frost, and USDA zone for 13 Colorado cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any Colorado ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Denver | Apr 30 | Oct 12 | about 165 days | 6a |
| Colorado Springs | May 3 | Oct 8 | about 158 days | 6a |
| Aurora | May 4 | Oct 8 | about 157 days | 6a |
| Fort Collins | May 2 | Oct 7 | about 158 days | 5b |
| Thornton | May 2 | Oct 11 | about 162 days | 6a |
| Arvada | May 5 | Oct 5 | about 153 days | 6a |
| Westminster | May 2 | Oct 11 | about 162 days | 6a |
| Grand Junction | Apr 14 | Oct 23 | about 192 days | 7a |
| Montrose | Apr 28 | Oct 14 | about 169 days | 6b |
| Durango | May 21 | Oct 2 | about 134 days | 6b |
| Sterling | Apr 30 | Oct 9 | about 162 days | 5b |
| Steamboat Springs | Jun 9 | Sep 12 | about 95 days | 4b |
| Rifle | May 23 | Sep 25 | about 125 days | 6a |
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