Fort Garland, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.6 °F (low) to 58.6 °F (high). Annual precipitation averages 11.3 Inches. Fort Garland is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.9 °F | 34.9 °F | 0.4 in. |
| February | 12.2 °F | 39.9 °F | 0.37 in. |
| March | 20.8 °F | 50.2 °F | 0.77 in. |
| April | 26.8 °F | 57.5 °F | 0.88 in. |
| May | 35.3 °F | 66.7 °F | 1.1 in. |
| June | 43.7 °F | 77.4 °F | 1.41 in. |
| July | 48.7 °F | 80.9 °F | 1.78 in. |
| August | 47.0 °F | 78.5 °F | 1.55 in. |
| September | 39.6 °F | 72.8 °F | 1.21 in. |
| October | 28.3 °F | 61.4 °F | 0.85 in. |
| November | 16.7 °F | 47.5 °F | 0.49 in. |
| December | 6.8 °F | 35.8 °F | 0.47 in. |
| Annual | 27.6 °F | 58.6 °F | 11.28 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |