Frost line depth in Maryland
Estimated frost depth in typical soil runs from 15″ to 34″ across Maryland's 24 counties. Pick your county or enter a ZIP code for a local estimate.
Deepest frost
- Garrett County 34″
- Allegany County 29″
- Washington County 27″
- Frederick County 27″
- Carroll County 26″
Mildest
- St. Mary's County 15″
- Somerset County 16″
- Baltimore city 16″
- Wicomico County 16″
- Dorchester County 16″
Frost depth by county
| County | Est. frost (typical soil) | Typical code range |
|---|---|---|
| Allegany County | 29″ | 24–36″ |
| Anne Arundel County | 20″ | 18–24″ |
| Baltimore city | 16″ | 12–24″ |
| Baltimore County | 21″ | 18–30″ |
| Calvert County | 17″ | 18–24″ |
| Caroline County | 19″ | 18–24″ |
| Carroll County | 26″ | 24–36″ |
| Cecil County | 24″ | 24–30″ |
| Charles County | 17″ | 18–24″ |
| Dorchester County | 16″ | 12–24″ |
| Frederick County | 27″ | 24–36″ |
| Garrett County | 34″ | 30–42″ |
| Harford County | 24″ | 18–30″ |
| Howard County | 22″ | 18–30″ |
| Kent County | 22″ | 18–30″ |
| Montgomery County | 21″ | 18–30″ |
| Prince George's County | 20″ | 18–24″ |
| Queen Anne's County | 20″ | 18–24″ |
| Somerset County | 16″ | 12–24″ |
| St. Mary's County | 15″ | 12–18″ |
| Talbot County | 17″ | 18–24″ |
| Washington County | 27″ | 24–36″ |
| Wicomico County | 16″ | 12–24″ |
| Worcester County | 16″ | 12–24″ |
Common questions
What is the frost line depth in Maryland?
It ranges from about 15 inches in the mildest county to 34 inches in the coldest, in typical soil.
Which Maryland county has the deepest frost?
Garrett County, at about 34 inches in typical soil.