Frost line depth in Prince of Wales-Hyder Census Area, AK

How deep the ground freezes in Prince of Wales-Hyder Census Area, AK

15 in. Dig to 16 in, just below the frost. Nearest NOAA station: Klawock Ap, 7.9 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.