Frost line depth in Mountrail County, ND

How deep the ground freezes in Mountrail County, ND

69 in. Dig to 70 in, just below the frost. Nearest NOAA station: Stanley 3 Nnw, 10.4 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.

Code depth · Snow