Frost dates across Colorado
Typical last spring frost, first fall frost, and USDA zone for 7 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.
| 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 |
Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.
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