Frost line depth in Clay County, IN

How deep the ground freezes in Clay County, IN

12 in. Dig to 13 in, just below the frost. Nearest NOAA station: Terre Haute Caa Ap, 10.6 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.