Frost line depth in Sweet Grass County, MT

How deep the ground freezes in Sweet Grass County, MT

33 in. Dig to 34 in, just below the frost. Nearest NOAA station: Big Timber, 1.5 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