Frost line depth in Henderson County, IL

How deep the ground freezes in Henderson County, IL

31 in. Dig to 31 in, just below the frost. Nearest NOAA station: Gladstone Dam 18, 6.3 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