Frost line depth in Kanabec County, MN
How deep the ground freezes in Kanabec County, MN
58 in. Dig to 59 in, just below the frost. Nearest NOAA station: Mora, 4.9 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.