Frost line depth in Pend Oreille County, WA

How deep the ground freezes in Pend Oreille County, WA

30 in. Dig to 31 in, just below the frost. Nearest NOAA station: Priest Rvr Exp Stn, 22.5 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