Frost line depth in Brookings County, SD

How deep the ground freezes in Brookings County, SD

55 in. Dig to 56 in, just below the frost. Nearest NOAA station: Brookings 2 Ne, 3.9 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