| 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: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 25d - Flat to Rolling Plains |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 80230 - Denver, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 19 | 25 | 33 | 42 | 51 | 57 | 56 | 46 | 35 | 23 | 16 | 35 |
| Avg Max Temp (°F) | 44 | 48 | 54 | 61 | 71 | 82 | 88 | 86 | 78 | 66 | 52 | 45 | 65 |
| Avg Precip (In.) | .51 | .49 | 1.39 | 2.03 | 2.61 | 1.82 | 2.31 | 1.95 | 1.32 | 1.01 | 1.09 | .65 | 17.19 |