Blackfoot, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 32.6 °F (low) to 58.6 °F (high). Annual precipitation averages 11.1 Inches. Blackfoot is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.2 °F | 31.5 °F | 0.93 in. |
| February | 18.1 °F | 36.5 °F | 0.67 in. |
| March | 26.4 °F | 48.4 °F | 1.07 in. |
| April | 31.6 °F | 57.6 °F | 1.17 in. |
| May | 39.3 °F | 67.1 °F | 1.69 in. |
| June | 45.8 °F | 76.1 °F | 0.88 in. |
| July | 51.5 °F | 86.5 °F | 0.42 in. |
| August | 49.9 °F | 85.9 °F | 0.62 in. |
| September | 42.2 °F | 75.5 °F | 0.97 in. |
| October | 32.5 °F | 60.6 °F | 1.1 in. |
| November | 23.4 °F | 44.9 °F | 0.75 in. |
| December | 15.5 °F | 32.4 °F | 0.87 in. |
| Annual | 32.6 °F | 58.6 °F | 11.14 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |