Lodge Grass, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.2 °C (low) to 16.1 °C (high). Annual precipitation averages 413.8 Millimeters. Lodge Grass is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.7 °C | 2.2 °C | 16.51 mm |
| February | -10.3 °C | 4.1 °C | 18.54 mm |
| March | -5.4 °C | 10 °C | 27.43 mm |
| April | -0.6 °C | 15.1 °C | 47.75 mm |
| May | 4.4 °C | 20.1 °C | 77.47 mm |
| June | 9.2 °C | 25.8 °C | 48.26 mm |
| July | 12.3 °C | 31.6 °C | 36.07 mm |
| August | 10.9 °C | 31.1 °C | 23.62 mm |
| September | 6.1 °C | 25.1 °C | 35.81 mm |
| October | -0.3 °C | 16.5 °C | 42.67 mm |
| November | -6.2 °C | 8.6 °C | 24.13 mm |
| December | -11.1 °C | 2.9 °C | 15.49 mm |
| Annual | -0.2 °C | 16.1 °C | 413.75 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |