Frost line depth in Mahnomen County, MN

How deep the ground freezes in Mahnomen County, MN

68 in. Dig to 68 in, just below the frost. Nearest NOAA station: Mahnomen, 7.4 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