Frost line depth in Lake County, OR
How deep the ground freezes in Lake County, OR
20 in. Dig to 20 in, just below the frost. Nearest NOAA station: Paisley, 10.1 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.