Frost dates by location
| Location | Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Denver | 6a | May 5 | Oct 9 | 157 |
| Grand Junction | 7a | Apr 23 | Oct 20 | 180 |
| Pueblo | 5b | Apr 30 | Oct 9 | 162 |
| Colorado Springs | 6a | May 13 | Oct 3 | 143 |
| Aurora | 6a | May 5 | Oct 8 | 156 |
| Fort Collins | 5b | May 17 | Sep 28 | 134 |
| Lakewood | 5b | May 11 | Oct 3 | 145 |
| Thornton | 6a | May 5 | Oct 8 | 156 |
| Westminster | 5b | May 11 | Oct 3 | 145 |
| Arvada | 5b | May 11 | Oct 3 | 145 |
| Centennial | 6a | May 5 | Oct 8 | 156 |
| Greeley | 5b | May 7 | Oct 4 | 150 |
| Boulder | 5b | May 20 | Sep 26 | 129 |
| Highlands Ranch | 6a | May 5 | Oct 8 | 156 |
| Longmont | 5b | May 20 | Sep 26 | 129 |
Zones in Colorado
Bottom line: a statewide planting date is a compromise nobody's garden actually
lives at. Colorado's last-frost spread is
27 days wide. Use the location nearest you.
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