| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 26e - Piedmont Plains and Tablelands |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 80817 - Fountain, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 25 | 33 | 43 | 51 | 57 | 56 | 46 | 36 | 24 | 17 | 35 |
| Avg Max Temp (°F) | 44 | 49 | 55 | 63 | 72 | 83 | 88 | 85 | 78 | 67 | 53 | 45 | 65 |
| Avg Precip (In.) | .31 | .32 | .87 | 1.55 | 2.22 | 2.14 | 3.14 | 3.33 | 1.17 | .81 | .52 | .39 | 16.76 |