Frost line depth in Perry County, IL

How deep the ground freezes in Perry County, IL

19 in. Dig to 19 in, just below the frost. Nearest NOAA station: Du Quoin 4 Se, 11.6 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