Claremont Hills Wilderness Park N. Mills Avenue and Mt. Baldy Road, Claremont, CA 91711 The Claremont Hills Wilderness Park is located at the base of the San Gabriel Mountains and the Angeles National Forest. The Park offers a five-mile walking loop and smaller trails. Parking for the park is available at parking lots on Mills Avenue and Mt. Baldy Road. Permits are required in the lots. Parking in the neighborhoods is restricted. Tagged as: , Nature, Trails Announcement : The Claremont Hills Wilderness Park is OPEN.