Frost line depth in Steele County, ND
How deep the ground freezes in Steele County, ND
73 in. Dig to 74 in, just below the frost. Nearest NOAA station: Colgate, 14.7 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.