The visitor center is open 7 days a week 8:00 a.m.-7:00 p.m. Memorial Day weekend through Labor Day weekend. September through May, the visitor center is open 8:00 a.m.– 4:30 p.m., 7 days a week, but closed winter holidays.
Monument grounds are open sunrise to sunset. The entrance road gate is closed only during severe winter storms. The upper road accessing the picnic area, Fossil Lake Trail, and scenic drive closes November 1st until the snow melts, usually by late May.