Frost line depth in Renville County, ND
How deep the ground freezes in Renville County, ND
72 in. Dig to 72 in, just below the frost. Nearest NOAA station: Mohall, 7.6 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.