Cottage Grove, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.1 °F (low) to 63.9 °F (high). Annual precipitation averages 45.9 Inches. Cottage Grove is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.5 °F | 48.4 °F | 6.52 in. |
| February | 34.8 °F | 52.1 °F | 5.0 in. |
| March | 36.5 °F | 56.6 °F | 5.15 in. |
| April | 39.5 °F | 61.1 °F | 4.45 in. |
| May | 44.3 °F | 67.9 °F | 2.91 in. |
| June | 48.4 °F | 73.3 °F | 1.7 in. |
| July | 52.2 °F | 82.0 °F | 0.4 in. |
| August | 51.7 °F | 83.0 °F | 0.48 in. |
| September | 47.8 °F | 77.3 °F | 1.52 in. |
| October | 42.5 °F | 65.2 °F | 3.58 in. |
| November | 38.2 °F | 53.4 °F | 6.64 in. |
| December | 34.4 °F | 46.7 °F | 7.59 in. |
| Annual | 42.1 °F | 63.9 °F | 45.94 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |