Sugarloaf Ridge State Park is a state park in Northern California, U.S.A.. Located in the Mayacamas Mountains north of Kenwood, the park straddles the boundary between Sonoma and Napa counties. The 2,729 feet (832 m) Bald Mountain and the headwaters of Sonoma Creek are located in the park, as are the Robert Ferguson Observatory and a 25-foot (8 m) tall seasonal waterfall. The ridge has two main peaks, the western one being 1,939 feet (591 m) above sea level and eastern one being 2,265 feet (690 m). The East peak contains an extensive microwave antenna. This site was featured in several articles of the Napa Valley Sentinel. The park's coordinates are , and its official address is 2605 Adobe Canyon Road, Kenwood, CA 95452.