Frost line depth in Dawes County, NE
How deep the ground freezes in Dawes County, NE
36 in. Dig to 37 in, just below the frost. Nearest NOAA station: Chadron 3sw, 7.8 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.