Frost line depth in Lake County, IL

How deep the ground freezes in Lake County, IL

32 in. Dig to 32 in, just below the frost. Nearest NOAA station: Chicago Botanic Garden, 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