| 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 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 5a: -20F to -15F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 21c - Crystalline Mid-Elevation Forests and Shrublands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 80452 - Idaho Springs, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 12 | 16 | 22 | 30 | 37 | 44 | 42 | 35 | 26 | 17 | 11 | 25 |
| Avg Max Temp (°F) | 35 | 38 | 44 | 49 | 57 | 68 | 74 | 72 | 65 | 55 | 42 | 36 | 53 |
| Avg Precip (In.) | .37 | .54 | 1.06 | 2.2 | 2.03 | 1.6 | 2.33 | 2.31 | 1.34 | .96 | .7 | .44 | 15.88 |