Frost line depth in Jerauld County, SD
How deep the ground freezes in Jerauld County, SD
49 in. Dig to 49 in, just below the frost. Nearest NOAA station: Wessington Springs, 2.7 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.