| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°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: | 25d - Flat to Rolling Plains |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 80621 - Fort Lupton, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 17 | 23 | 31 | 41 | 50 | 55 | 53 | 43 | 32 | 20 | 13 | 32 |
| Avg Max Temp (°F) | 41 | 48 | 54 | 62 | 73 | 83 | 89 | 87 | 78 | 67 | 50 | 43 | 65 |
| Avg Precip (In.) | .38 | .4 | 1.18 | 1.62 | 2.34 | 1.53 | 1.4 | 1.43 | 1.09 | .83 | .82 | .35 | 13.38 |