| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 25l - Front Range Fans |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 80007 - Arvada, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 24 | 31 | 40 | 49 | 55 | 53 | 44 | 34 | 24 | 17 | 34 |
| Avg Max Temp (°F) | 44 | 47 | 53 | 60 | 69 | 80 | 86 | 84 | 76 | 65 | 51 | 45 | 63 |
| Avg Precip (In.) | .5 | .48 | 1.41 | 2.23 | 2.73 | 1.85 | 1.55 | 1.72 | 1.36 | .92 | .96 | .65 | 16.37 |