| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 26i - Pine-Oak Woodlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 80118 - Larkspur, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 16 | 22 | 28 | 37 | 47 | 52 | 51 | 42 | 31 | 20 | 14 | 31 |
| Avg Max Temp (°F) | 42 | 45 | 50 | 56 | 65 | 76 | 82 | 80 | 73 | 62 | 49 | 43 | 60 |
| Avg Precip (In.) | .62 | .54 | 1.69 | 2.56 | 2.74 | 1.93 | 2.56 | 2.66 | 1.42 | 1.13 | 1.19 | .82 | 19.87 |