Frost line depth in Rock Island County, IL

How deep the ground freezes in Rock Island County, IL

32 in. Dig to 33 in, just below the frost. Nearest NOAA station: Moline Quad City Intl Ap, 2.5 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