Suisun Valley lies within the Vaca Mountains to the east and Mt George Range to the west.
This region begins at the marshlands of Suisun Bay and rolls north to the Wooden Valley at the Napa County line. Cool moist winds from San Francisco and San Pablo Bays influence the climate.
The Valley is approximately 8 miles by 3 miles. Approximately 3,000 of 15,000 acres are vineyards.