The standard hours for Mount Rainier National Park are easy: it is open 24 hrs daily. However, there are some exceptions to note: While the park is open all year, many facilities and roads are only open seasonally and close in the winter. Be sure to check the road status as you plan your visit. Park entrances Nisqually and Carbon River are open 24/7 year-round regardless of national holidays. However, entrances like the SR 410/North Entrance, SR123/Ohanapecosh, Stevens Canyon, Chinook, and White River may experience closures on holidays such as New Year's Day (Jan 1), Martin Luther King Jr. Day (Jan 18), Washington's Birthday (Feb 15), Memorial Day (May 31), Independence Day (July 4), Labor Day (Sept 6), Columbus Day (Oct 11), Veterans Day (Nov 11), Thanksgiving (Nov 25), Christmas Day (Dec 25). There are also seasonal closures to be aware of. From November 12-May 27, the SR 410/North Entrance, SR123/Ohanapecosh, and Chinook entrances are closed. From September 14-May 28 the Stevens Canyon entrance is closed, and from November 7-May 27 the White River entrance will be closed. Please be aware of these seasonal and holiday closures as you plan your trip, but rest assured knowing that at least a few entrances will always be available to provide access to the beautiful Mt.Rainier Park. For more information, visit the National Park Website.