Since 1982, Duncan Peak Vineyards has specialized in growing Cabernet Sauvignon and Petite Sirah grapes and producing excellent Cabernet Sauvignon and Petite Sirah wines in this estate grown and produced wine property known as Duncan Ranch, at the base of Duncan Peak on the edge of the Sanel Valley near Hopland, California. The grapes are grown with as many sustainable and organic farming techniques as possible.