Frost line depth in Gogebic County, MI
How deep the ground freezes in Gogebic County, MI
62 in. Dig to 62 in, just below the frost. Nearest NOAA station: Bergland Dam, 13.3 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.