Frost line depth in Bonner County, ID

How deep the ground freezes in Bonner County, ID

26 in. Dig to 26 in, just below the frost. Nearest NOAA station: Sandpoint Exp Stn, 3.6 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