Grants Pass, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.3 °F (low) to 67.8 °F (high). Annual precipitation averages 32.3 Inches. Grants Pass 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 Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.9 °F | 47.9 °F | 5.35 in. |
| February | 34.5 °F | 54.2 °F | 4.0 in. |
| March | 36.2 °F | 59.4 °F | 3.78 in. |
| April | 39.4 °F | 64.9 °F | 2.31 in. |
| May | 44.6 °F | 73.7 °F | 1.29 in. |
| June | 49.6 °F | 80.6 °F | 0.69 in. |
| July | 55.0 °F | 89.8 °F | 0.36 in. |
| August | 53.8 °F | 90.0 °F | 0.24 in. |
| September | 47.6 °F | 83.5 °F | 0.61 in. |
| October | 40.8 °F | 69.4 °F | 2.17 in. |
| November | 37.7 °F | 54.2 °F | 4.58 in. |
| December | 34.1 °F | 45.9 °F | 6.88 in. |
| Annual | 42.3 °F | 67.8 °F | 32.26 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |