Frost line depth in Converse County, WY
How deep the ground freezes in Converse County, WY
37 in. Dig to 38 in, just below the frost. Nearest NOAA station: Douglas Converse Co Ap, 14.7 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.