| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| 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: | 25l - Front Range Fans |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 80026 - Lafayette, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 20 | 26 | 33 | 43 | 51 | 57 | 56 | 46 | 36 | 25 | 18 | 36 |
| Avg Max Temp (°F) | 44 | 48 | 55 | 62 | 72 | 83 | 88 | 86 | 78 | 67 | 52 | 45 | 65 |
| Avg Precip (In.) | .46 | .38 | 1.2 | 2.05 | 2.44 | 1.72 | 1.56 | 1.47 | 1.19 | .91 | .86 | .52 | 14.74 |