| 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 5a: -20F to -15F |
| 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 80027 - Louisville, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 21 | 27 | 34 | 42 | 51 | 56 | 55 | 46 | 36 | 26 | 19 | 36 |
| Avg Max Temp (°F) | 45 | 48 | 55 | 62 | 71 | 82 | 87 | 85 | 77 | 66 | 52 | 45 | 65 |
| Avg Precip (In.) | .51 | .48 | 1.38 | 2.22 | 2.7 | 1.84 | 1.52 | 1.61 | 1.43 | .97 | .97 | .62 | 16.25 |