Frost line depth in Cleveland County, OK
How deep the ground freezes in Cleveland County, OK
13 in. Dig to 13 in, just below the frost. Nearest NOAA station: Norman 3sse, 6.7 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.