Frost line depth in Jo Daviess County, IL

How deep the ground freezes in Jo Daviess County, IL

40 in. Dig to 41 in, just below the frost. Nearest NOAA station: Elizabeth, 3.3 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