Frost line depth in Belknap County, NH

How deep the ground freezes in Belknap County, NH

37 in. Dig to 38 in, just below the frost. Nearest NOAA station: Lakeport 2, 2.9 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