Frost line depth in Luce County, MI
How deep the ground freezes in Luce County, MI
51 in. Dig to 52 in, just below the frost. Nearest NOAA station: Newberry Correctional Facility, 12.6 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.