Frost line depth in Athens County, OH
How deep the ground freezes in Athens County, OH
22 in. Dig to 22 in, just below the frost. Nearest NOAA station: Athens Ou, 2.9 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.