Frost line depth in Cook County, MN

How deep the ground freezes in Cook County, MN

54 in. Dig to 54 in, just below the frost. Nearest NOAA station: Grand Marais, 0.8 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