Colorado frost dates: G
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Galeton | May 12 | Sep 28 | 139 d | 5a |
| Gardner | May 27 | Sep 25 | 121 d | 6a |
| Gateway | Apr 20 | Oct 21 | 184 d | 6b |
| Genoa | May 8 | Oct 10 | 155 d | 5b |
| Georgetown | May 30 | Sep 19 | 112 d | 5a |
| Gilcrest | May 2 | Oct 8 | 159 d | 5a |
| Gill | May 2 | Oct 8 | 159 d | 5a |
| Glade Park | Apr 26 | Oct 16 | 173 d | 6b |
| Glen Haven | May 30 | Sep 17 | 110 d | 5b |
| Glenwood Springs | May 13 | Oct 3 | 143 d | 6a |
| Golden | May 3 | Oct 7 | 157 d | 5b |
| Granada | May 1 | Oct 12 | 164 d | 6a |
| Granby | Jun 13 | Sep 7 | 86 d | 5a |
| Grand Junction | Apr 23 | Oct 20 | 180 d | 7a |
| Grand Lake | frost any month | 5a | ||
| Granite | Jun 16 | Sep 10 | 86 d | 5a |
| Grant | Jun 15 | Sep 9 | 86 d | 5b |
| Greeley | May 2 | Oct 8 | 159 d | 5b |
| Green Mountain Falls | Jun 3 | Sep 17 | 106 d | 5b |
| Grover | May 14 | Sep 26 | 135 d | 5a |
| Guffey | Jun 2 | Sep 19 | 109 d | 5b |
| Gunnison | frost any month | 5b | ||
| Gypsum | May 1 | Oct 14 | 166 d | 5b |