Frost line depth in St. Mary's County, MD

How deep the ground freezes in St. Mary's County, MD

13 in. Dig to 13 in, just below the frost. Nearest NOAA station: St Inigoes Webster Nolf, 8 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