Frost line depth in Morris County, NJ

How deep the ground freezes in Morris County, NJ

21 in. Dig to 22 in, just below the frost. Nearest NOAA station: Boonton 1 Se, 8.2 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