| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F 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: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 21c - Crystalline Mid-Elevation Forests and Shrublands |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 80403 - Golden, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 13 | 17 | 22 | 31 | 38 | 45 | 43 | 36 | 27 | 18 | 13 | 26 |
| Avg Max Temp (°F) | 36 | 39 | 44 | 50 | 59 | 70 | 77 | 74 | 67 | 56 | 44 | 38 | 55 |
| Avg Precip (In.) | .95 | .88 | 2.15 | 2.77 | 3.05 | 2.04 | 2.22 | 2.19 | 1.63 | 1.19 | 1.24 | 1.01 | 21.31 |