Hurricane Ridge Visitor Center overlooks mountain valleys in Olympic National Park. NPS Photo. Olympic National Park is Open. Olympic National Park is open 24 hours a day, year-round. The most popular months to visit are June through September. During the busy summer season, most roads and facilities are open and a full range of programs are available to enjoy. From October through May, some roads, campgrounds, and other visitor facilities are closed or have reduced hours. Visitor centers and Hurricane Ridge Road are closed Thanksgiving and Christmas. Other roads and facilities remain open, weather permitting. Operating Hours & Seasons - Olympic National Park (U.S. National Park Service)