| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Aug. 1 - Aug. 10 |
| Average Last Frost Date: | Frost Year Round |
| Koppen-Geiger Climate Zone: | Dfc - Subarctic With Cool Summers And Year Around Rainfall |
| Ecoregion: | 21e - Sedimentary Subalpine Forests |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 80498 - Silverthorne, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 8 | 13 | 19 | 27 | 34 | 39 | 39 | 32 | 24 | 13 | 6 | 21 |
| Avg Max Temp (°F) | 28 | 33 | 39 | 46 | 55 | 66 | 71 | 70 | 62 | 51 | 36 | 29 | 49 |
| Avg Precip (In.) | 1.72 | 1.84 | 2.39 | 2.57 | 2.26 | 1.23 | 1.69 | 1.57 | 1.32 | 1.36 | 1.9 | 1.83 | 21.68 |