Frost line depth in Allegheny County, PA

How deep the ground freezes in Allegheny County, PA

21 in. Dig to 22 in, just below the frost. Nearest NOAA station: Emsworth L/D Ohio Rvr, 6.2 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