Frost line depth in Wheeler County, OR
How deep the ground freezes in Wheeler County, OR
18 in. Dig to 18 in, just below the frost. Nearest NOAA station: Mitchell 2 E, 12.4 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.