Frost line depth in Washington County, MN

How deep the ground freezes in Washington County, MN

52 in. Dig to 52 in, just below the frost. Nearest NOAA station: Stillwater 2sw, 1.9 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.

Code depth · Snow