The gate to Paradise at Longmire closes nightly.
Mon-Fri: Closes at 5:00 pm, depart Paradise no later than 4:30 pm to safely drive down the hill before the gate closes. Sat-Sun: Closes at 7:00 pm, depart Paradise no later than 6:30 pm. More »
The Snow Play area in Paradise is open on weekends and holidays.
The Paradise snow play area for sledding and sliding is open Sat-Sun, and on holidays. More »
Watch out for hazardous winter conditions!
As the amount of snow in the park increases, be aware of increased risk of Avalanches and Snow Immersion Suffocation. More »
Mount Rainier is an episodically active composite volcano, also called a stratovolcano. Volcanic activity began between one half and one million years ago and last erupted as recently as the 1890s. Over the past half million years, Mount Rainier has erupted again and again, alternating between quiet lava-producing eruptions and explosive debris-producing eruptions. The eruptions built up layer after layer of lava and loose rubble, eventually forming the tall cone that characterizes composite volcanoes. At one time, lava flows on opposite sides of the mountain probably projected more than 1,000 feet (305 meters) above the present summit at Columbia Crest which rises 14,410 feet (4392 meters) above sea level on the rim of the recent lava cone. The upper portion of the volcano's cone was likely removed by explosions and landslides. Mount Rainier's extensive glacier system then carved the volcano's cone into its current craggy form.
Mount Rainier also sits on a subduction zone where colliding continental and oceanic plates cause regular seismic and geothermal activity. A subduction zone is an area where one continental plate is being forced underneath another into the earth's mantel. Mount Rainier experiences about 20 small earthquakes a year, making it the second most seismically active volcano in the northern Cascade Range after Mount St. Helens. Learn more about Mount Rainier's seismicity.
Hazards of Mount Rainier
The potential hazards posed by Mount Rainier led to its inclusion as one of the sixteen volcanoes worldwide to be designated Decade Volcanoes. The Decade Volcano initiative is part of a United Nations program aimed at better utilizing science and emergency management to reduce the severity of natural disasters. Mount Rainier was chosen to be studied because it is representative of one or more volcanic hazards: it is geologically active as evidenced by surface manifestation of heat (geothermal activity), it has had recent volcanic events (last eruption was about 150 years ago), and it is likely to erupt again, based on past history; its location poses significant hazards to a heavily populated area; it is a well known volcano (a number of research publications have been written on it); it is politically and physically accessible for study; and its volcanic geology is well exposed.
In 1992 National Park Service staff participated with other agencies and individuals to develop a science plan through the National Academy of Sciences, for organizing the needed research to evaluate the hazards and risks associated with Mount Rainier and for developing communication efforts of the risks for appropriate planning activities. The science plan was published in Mount Rainier Active Cascade Volcano and is available in the park library. Several studies related to geologic hazards are being conducted by the USGS, other federal and state agencies, and academic institutions.
Additional Mount Rainier Volcano Information:
Did You Know?
In 1792, Captain George Vancouver of the British Navy became the first European to sail into the Puget Sound. On the horizon, he noted a large, snowy mountain, known to local Native Americans as Tahoma, Takhoma, or Tacobet. Vancouver named it for his colleague Rear Admiral Peter Rainier.