Frost line depth in Eaton County, MI
How deep the ground freezes in Eaton County, MI
36 in. Dig to 37 in, just below the frost. Nearest NOAA station: Charlotte, 2.9 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.