Idaho Falls, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 31.4 °F (low) to 57.4 °F (high). Annual precipitation averages 12.3 Inches. Idaho Falls is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.4 °F | 29.2 °F | 1.12 in. |
| February | 15.7 °F | 34.2 °F | 0.77 in. |
| March | 25.2 °F | 46.9 °F | 1.1 in. |
| April | 31.1 °F | 57.2 °F | 1.18 in. |
| May | 38.8 °F | 66.5 °F | 1.71 in. |
| June | 45.2 °F | 75.1 °F | 1.24 in. |
| July | 50.6 °F | 85.6 °F | 0.56 in. |
| August | 48.7 °F | 85.2 °F | 0.62 in. |
| September | 41.3 °F | 74.7 °F | 1.01 in. |
| October | 31.5 °F | 59.9 °F | 1.15 in. |
| November | 22.3 °F | 43.3 °F | 0.83 in. |
| December | 13.7 °F | 30.6 °F | 0.98 in. |
| Annual | 31.4 °F | 57.4 °F | 12.27 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| 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 | BSk - Cold Semi-Arid Climate |