Frost line depth in Plymouth County, MA

How deep the ground freezes in Plymouth County, MA

18 in. Dig to 18 in, just below the frost. Nearest NOAA station: Plymouth-Kingston, 2.4 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