Frost line depth in Northwest Arctic Borough, AK

How deep the ground freezes in Northwest Arctic Borough, AK

97 in. Dig to 97 in, just below the frost. Nearest NOAA station: Kotzebue Ralph Wein Ap, 71.3 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.

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