Joshua Tree National Park Joshua Tree National Park Phone: 760-367-5500 or 760-366-1855 Joshua Tree National Park Official Web Site Joshua Tree National Park Association National Parks Conservation Association For information on campgrounds, group campsites, Park wildflower hikes, Desert Institute wildlife and nature classes, road conditions and other Park-related questions, please call 760-367-5500 (29 Palms Visitors Center) or 760-366-1855 (Joshua Tree Visitors Center) Visitor centers The park's main visitor center is located at the Oasis of Mara in Twentynine Palms. It is open 8 a.m. to 5 p.m. Joshua Tree Visitor Center is open 8 am to 5 pm, 7 days and is located at 6554 Park Blvd., Joshua Tree. Turn south onto Park Blvd from Hwy 62. The Cottonwood visitor center at the south entrance (off I-10) is open from 8 a.m. to 4 p.m. Black Rock Canyon Campground visitor center off Joshua Lane in Yucca Valley is open September through June, Thursday through Sunday, from 8 a.m. to 4 p.m.; times may vary.