Frost line depth in New Castle County, DE

How deep the ground freezes in New Castle County, DE

16 in. Dig to 17 in, just below the frost. Nearest NOAA station: Wilmington New Castle Co Ap, 7.1 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