Frost line depth in Silver Bow County, MT

How deep the ground freezes in Silver Bow County, MT

52 in. Dig to 52 in, just below the frost. Nearest NOAA station: Butte Bert Mooney Ap, 9 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