Frost line depth in Berkshire County, MA
How deep the ground freezes in Berkshire County, MA
38 in. Dig to 38 in, just below the frost. Nearest NOAA station: Lenox Dale, 3 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.