Frost line depth in Cimarron County, OK
How deep the ground freezes in Cimarron County, OK
16 in. Dig to 16 in, just below the frost. Nearest NOAA station: Boise City 2 E, 2.7 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.