Frost line depth in Laramie County, WY
How deep the ground freezes in Laramie County, WY
31 in. Dig to 31 in, just below the frost. Nearest NOAA station: Archer, 9.8 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.