Frost line depth in St. Joseph County, IN

How deep the ground freezes in St. Joseph County, IN

23 in. Dig to 24 in, just below the frost. Nearest NOAA station: S Bend, 6.1 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.