Frost line depth in Baraga County, MI
How deep the ground freezes in Baraga County, MI
62 in. Dig to 62 in, just below the frost. Nearest NOAA station: Herman, 2.2 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.