Frost line depth in Nantucket County, MA

How deep the ground freezes in Nantucket County, MA

16 in. Dig to 16 in, just below the frost. Nearest NOAA station: Nantucket Mem Ap, 3.5 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