Frost line depth in Twin Falls County, ID

How deep the ground freezes in Twin Falls County, ID

24 in. Dig to 25 in, just below the frost. Nearest NOAA station: Twin Falls Sun Vly Rgnl Ap, 12.8 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