Frost line depth in Bon Homme County, SD

How deep the ground freezes in Bon Homme County, SD

43 in. Dig to 44 in, just below the frost. Nearest NOAA station: Tyndall, 0.8 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.

Code depth · Snow