Frost line depth in Somerset County, ME
How deep the ground freezes in Somerset County, ME
58 in. Dig to 59 in, just below the frost. Nearest NOAA station: Moosehead, 12.8 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.