| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 18a - Rolling Sagebrush Steppe |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 81639 - Hayden, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 10 | 20 | 28 | 36 | 42 | 48 | 47 | 39 | 29 | 18 | 9 | 27 |
| Avg Max Temp (°F) | 29 | 35 | 44 | 56 | 66 | 77 | 84 | 82 | 73 | 61 | 43 | 32 | 57 |
| Avg Precip (In.) | 1.66 | 1.23 | 1.31 | 1.6 | 1.68 | 1.11 | 1.45 | 1.36 | 1.46 | 1.69 | 1.52 | 1.5 | 17.59 |