Frost line depth in Deuel County, SD
How deep the ground freezes in Deuel County, SD
58 in. Dig to 59 in, just below the frost. Nearest NOAA station: Clear Lake, 0.4 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.