Frost line depth in Sanders County, MT

How deep the ground freezes in Sanders County, MT

45 in. Dig to 46 in, just below the frost. Nearest NOAA station: Libby 32 Sse, 14 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