Frost line depth in Connecticut
Estimated frost depth in typical soil runs from 27″ to 34″ across Connecticut's 8 counties. Pick your county or enter a ZIP code for a local estimate.
Deepest frost
- Litchfield County 34″
- Windham County 32″
- Hartford County 31″
- Tolland County 31″
- New Haven County 29″
Mildest
- Fairfield County 27″
- Middlesex County 28″
- New London County 29″
- New Haven County 29″
- Tolland County 31″
Frost depth by county
| County | Est. frost (typical soil) | Typical code range |
|---|---|---|
| Fairfield County | 27″ | 24–36″ |
| Hartford County | 31″ | 24–42″ |
| Litchfield County | 34″ | 30–42″ |
| Middlesex County | 28″ | 24–36″ |
| New Haven County | 29″ | 24–36″ |
| New London County | 29″ | 24–36″ |
| Tolland County | 31″ | 24–42″ |
| Windham County | 32″ | 30–42″ |
Common questions
What is the frost line depth in Connecticut?
It ranges from about 27 inches in the mildest county to 34 inches in the coldest, in typical soil.
Which Connecticut county has the deepest frost?
Litchfield County, at about 34 inches in typical soil.