East of Napa State Hospital in the southern foothills of Napa Valley, this out-and-back trail is for hardy hikers and careful equestrians and mountain bikers; it is a narrow, often rocky trail. After a steep climb in the first mile, the trail ambles through oak forests and high grasslands to views of North Bay marshes and mountains and then continues beside a perennial stream to the far reaches of the park. In October 2017, the Atlas Fire burned through most of Skyline Wilderness Park and damaged parts of the Ridge Trail. In the months following the fire, hundreds of damaged trees were removed. Start early, particularly on warm days, and take plenty of water. The trail arrives to Suscol Headwaters Park, which opened in 2020 and has several new trail slated to be opened by 2022.