Frost line depth in Latah County, ID

How deep the ground freezes in Latah County, ID

21 in. Dig to 21 in, just below the frost. Nearest NOAA station: Potlatch 3 Nne, 11.4 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