Frost line depth in Grand Forks County, ND

How deep the ground freezes in Grand Forks County, ND

69 in. Dig to 69 in, just below the frost. Nearest NOAA station: Grand Forks Intl Ap, 12.4 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