| 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: | 25d - Flat to Rolling Plains |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 80002 - Arvada, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 25 | 32 | 42 | 51 | 56 | 55 | 46 | 35 | 24 | 18 | 35 |
| Avg Max Temp (°F) | 44 | 48 | 53 | 60 | 69 | 80 | 86 | 84 | 76 | 65 | 52 | 45 | 64 |
| Avg Precip (In.) | .54 | .57 | 1.45 | 2.21 | 2.56 | 1.97 | 1.75 | 1.84 | 1.21 | 1.13 | 1.08 | .68 | 16.98 |