Frost line depth in Bonneville County, ID

How deep the ground freezes in Bonneville County, ID

43 in. Dig to 44 in, just below the frost. Nearest NOAA station: Idaho Falls 16 Se, 8.9 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