Frost line depth in Sargent County, ND
How deep the ground freezes in Sargent County, ND
62 in. Dig to 63 in, just below the frost. Nearest NOAA station: Forman 5 Sse, 5.4 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.