Walden, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -5.1 °C (low) to 11.1 °C (high). Annual precipitation averages 328.4 Millimeters. Walden is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around July 21 - July 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.5 °C | -1.6 °C | 21.59 mm |
| February | -13.6 °C | -0.3 °C | 23.11 mm |
| March | -9.2 °C | 4.6 °C | 18.8 mm |
| April | -5.5 °C | 9.3 °C | 29.97 mm |
| May | -1.2 °C | 15.1 °C | 38.1 mm |
| June | 2.7 °C | 21.2 °C | 29.21 mm |
| July | 5.1 °C | 25.1 °C | 34.29 mm |
| August | 3.8 °C | 24.2 °C | 32 mm |
| September | -0.1 °C | 19.9 °C | 34.04 mm |
| October | -4.7 °C | 12.5 °C | 25.4 mm |
| November | -9.5 °C | 4.3 °C | 21.34 mm |
| December | -14.2 °C | -1.4 °C | 20.57 mm |
| Annual | -5.1 °C | 11.1 °C | 328.42 mm |
| Average First Frost Date | July 21 - July 31 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |