Visitor Center Hours
- Summer Hours: (Memorial Day through September 24) 8 a.m. to 6 p.m. daily
- Off-Season Hours: 8 a.m. to 4:30 p.m. daily (closed on federal holidays in winter)
The Monument and Preserve is open every day of the year, 24 hours a day. Winter snows usually prevent automobile access around the Loop Road from mid-November through mid-March.