| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep.1 - Sep. 10 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 22b - San Luis Alluvial Flats and Wetlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 81102 - Alamosa, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -3 | 4 | 16 | 23 | 32 | 41 | 47 | 45 | 36 | 24 | 11 | -1 | 23 |
| Avg Max Temp (°F) | 33 | 40 | 49 | 58 | 68 | 78 | 82 | 79 | 73 | 62 | 46 | 35 | 59 |
| Avg Precip (In.) | .25 | .21 | .45 | .53 | .67 | .58 | .95 | 1.21 | .88 | .66 | .48 | .33 | 7.19 |