Yes, but some areas of the park, including Sunrise, White River, Ohanapecosh, Chinook Pass (SR 410), Cayuse Pass (SR 123), and the Stevens Canyon Road close for the season in mid-October or early-November and do not reopen until late spring to early summer. Click here for current road conditions. You may also call Mt. Rainier National Part at 360-569-2211 for a recorded message on road conditions. The Longmire are is open all year. The road from Longmire to Paradise is generally open during the winter, although closed and gated at Longmire every evening and anytime snow, ice, or potential avalanches make travel to Paradise unsafe.
The Longmire Museum is open year-round. The Jackson Visitor Center at Paradise is open weekends and holidays in the winter and daily from early May through early October. The National Park Inn at Longmire is open year-round. The Paradise Inn is open from mid-May to October only.