High Ridge is a hiking, biking, and horse trail in Napa County and Sonoma County, California. It is within Sugarloaf Ridge State Park. It is 1.7 miles long and begins at 2,683 feet altitude. Traveling the entire trail is 3.5 miles with a total elevation gain of 1,271 feet. The trail ends near Bald Mountain (elevation 2,730 feet) and the Bald Mountain viewpoint.