Frost line depth in Oregon
Estimated frost depth in typical soil runs from 5″ to 35″ across Oregon's 37 counties. Pick your county or enter a ZIP code for a local estimate.
Deepest frost
- Grant County 35″
- Wallowa County 35″
- Baker County 34″
- Harney County 31″
- Malheur County 30″
Mildest
Frost depth by county
| County | Est. frost (typical soil) | Typical code range |
|---|---|---|
| Baker County | 34″ | 30–42″ |
| Benton County | 13″ | 12–18″ |
| Clackamas County | 13″ | 12–18″ |
| Clatsop County | 9″ | 12–18″ |
| Columbia County | 14″ | 12–18″ |
| Coos County | 5″ | 12–18″ |
| Crook County | 30″ | 24–36″ |
| Curry County | 5″ | 12–18″ |
| Deschutes County | 27″ | 24–36″ |
| Douglas County | 10″ | 12–18″ |
| Gilliam County | 27″ | 24–36″ |
| Grant County | 35″ | 30–48″ |
| Harney County | 31″ | 24–42″ |
| Hood River County | 21″ | 18–30″ |
| Jackson County | 11″ | 12–18″ |
| Jefferson County | 25″ | 24–30″ |
| Josephine County | 10″ | 12–18″ |
| Klamath County | 27″ | 24–36″ |
| Lake County | 27″ | 24–36″ |
| Lane County | 13″ | 12–18″ |
| Lincoln County | 9″ | 12–18″ |
| Linn County | 13″ | 12–18″ |
| Malheur County | 30″ | 24–42″ |
| Marion County | 14″ | 12–18″ |
| Modoc County | 29″ | 24–36″ |
| Morrow County | 26″ | 24–36″ |
| Multnomah County | 13″ | 12–18″ |
| Polk County | 12″ | 12–18″ |
| Sherman County | 27″ | 24–36″ |
| Tillamook County | 9″ | 12–18″ |
| Umatilla County | 27″ | 24–36″ |
| Union County | 28″ | 24–36″ |
| Wallowa County | 35″ | 30–42″ |
| Wasco County | 25″ | 24–30″ |
| Washington County | 14″ | 12–18″ |
| Wheeler County | 27″ | 24–36″ |
| Yamhill County | 13″ | 12–18″ |
Common questions
What is the frost line depth in Oregon?
It ranges from about 5 inches in the mildest county to 35 inches in the coldest, in typical soil.
Which Oregon county has the deepest frost?
Grant County, at about 35 inches in typical soil.