Frost line depth in Carroll County, NH

How deep the ground freezes in Carroll County, NH

46 in. Dig to 46 in, just below the frost. Nearest NOAA station: Tamworth 4, 3.2 mi.

Your building department sets the legal frost line depth (IRC Table R301.2(1)); footings must go below it (R403.1.4.1). Call them before you dig.

Code depth · Snow