Colorado frost dates by city
| City | Last frost (50%) | Safer date (10%) | First frost (50%) | Season |
|---|---|---|---|---|
| Colorado Springs | May 3 | May 15 | Oct 8 | 158 days |
| Denver | May 5 | May 19 | Oct 9 | 156 days |
| Grand Junction | Apr 28 | May 14 | Oct 16 | 171 days |
| Pueblo | Apr 30 | May 12 | Oct 9 | 161 days |
Each city uses its nearest major NOAA weather station, usually the airport. Valleys, hilltops and rural spots can differ from it by one to three weeks. How to read these dates.