Tags: Winery.
Oak Knoll Winery is a privately held winery located in the Tualatin Valley near Hillsboro Oregon United States. Established in 1970 it is the largest winery in Washington County and produces Pinot noir Pinot gris and Chardonnay.Its prolific variety of wines owes to its rather unusual lack of its own vineyard. It obtains grapes from area producers instead.