Frontier, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.8 °F (low) to 51.9 °F (high). Annual precipitation averages 24.4 Inches. Frontier is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.4 °F | 17.0 °F | 0.72 in. |
| February | 3.7 °F | 22.3 °F | 0.62 in. |
| March | 17.2 °F | 35.1 °F | 1.05 in. |
| April | 31.8 °F | 53.2 °F | 1.39 in. |
| May | 44.8 °F | 67.6 °F | 3.04 in. |
| June | 56.1 °F | 76.8 °F | 4.41 in. |
| July | 59.8 °F | 81.0 °F | 3.51 in. |
| August | 56.9 °F | 80.1 °F | 2.68 in. |
| September | 47.9 °F | 71.7 °F | 2.92 in. |
| October | 35.4 °F | 55.9 °F | 2.39 in. |
| November | 21.0 °F | 38.0 °F | 0.84 in. |
| December | 7.8 °F | 23.5 °F | 0.8 in. |
| Annual | 31.8 °F | 51.9 °F | 24.37 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |