Frost line depth in Toole County, MT

How deep the ground freezes in Toole County, MT

51 in. Dig to 52 in, just below the frost. Nearest NOAA station: Shelby, 10.7 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