Frost line depth in Lehigh County, PA

How deep the ground freezes in Lehigh County, PA

20 in. Dig to 20 in, just below the frost. Nearest NOAA station: Allentown Intl Ap, 7.8 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