Frost line depth in Big Horn County, MT

How deep the ground freezes in Big Horn County, MT

39 in. Dig to 39 in, just below the frost. Nearest NOAA station: Wyola 1 Sw, 20.5 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 · Method