Why Mount Rainier is famous
Rainier is the highest peak in Washington and the Cascades, and with 26 major glaciers and about 93 km² (36 square miles) of permanent snow and ice it carries more ice than any other mountain in the contiguous United States. The Emmons Glacier on the north-east side has the largest area of the mountain's glaciers, and the Carbon Glacier is the longest and thickest. Its prominence makes it the fourth most prominent peak in North America.
The figure of 14,410 ft (4,392 m) for the summit, the snow dome of Columbia Crest, has been used for decades, with 14,411 ft in some surveys. As the ice cap shrinks, recent measurements give lower values: a survey by Eric Gilbertson found the highest point is now bare rock on the south-west crater rim at about 14,399.6 ft (4,389 m), and current references give 14,406 ft (4,391 m). Two lower summits rise from the rim of the summit plateau: Point Success (4,315 m) to the south and Liberty Cap (4,301 m) to the north-west. The summit holds two volcanic craters, each more than 300 m across, and beneath their ice lies the world's largest network of volcanic glacier caves, with nearly 3.2 km of passages melted out by steam vents.
An active volcano
Rainier is an active stratovolcano and one of the Decade Volcanoes chosen for special study because of their danger to nearby populations. The US Geological Survey rates its threat as "very high". The greatest hazard is not lava but lahars: fast mudflows of rock, ice and water. The upper cone is weakened by hydrothermal alteration, and about 5,600 years ago a collapse sent the Osceola Mudflow all the way to the Puget Sound lowlands. Large lahars from Rainier have reached those lowlands in the past, and today about 80,000 people and their homes stand in its lahar hazard zones; the valleys below have lahar detection systems watched by the USGS Cascades Volcano Observatory. The USGS dates the most recent eruption to about 1,000 years ago, while some sources cite a smaller event around 1450.
Where it is and how to get there
The mountain is about 95 km (59 miles) south-east of Seattle and visible from much of the region. Most visitors come by car via the Nisqually entrance in the south-west to Longmire and Paradise (about 1,650 m, 5,400 ft), with its visitor centre and climbing ranger station. The north-east side is reached by the White River entrance and Sunrise; the White River road usually opens only around late May.
Non-climbers have plenty to do. The Skyline Trail climbs through the meadows above Paradise, and the Wonderland Trail circles the whole mountain: about 150 km (93 miles) with roughly 8,200 m (27,000 ft) of total ascent and descent, eighteen wilderness camps and three road-accessible camps. It is usually mostly free of snow from mid-July to October, overnight stays need a wilderness permit, and food caches can be left at several points along the way.
Routes
Disappointment Cleaver–Ingraham Glacier (DC). The standard route takes about 75% of all summit attempts, some 7,600 climbers a year, with an average success rate of 51%. It gains about 2,750 m (9,000 ft) over 13–15 km (8–9 miles) and usually takes one to three days. From the Paradise ranger station (1,652 m, 5,420 ft) the Skyline Trail leads 4 km (2.5 miles) to Pebble Creek at 2,195 m, the foot of the Muir Snowfield. The broad, featureless snowfield climbs to Camp Muir (3,105 m, 10,188 ft) on a rock ridge between the snowfield and the Cowlitz Glacier; rangers estimate 5–6 hours from Paradise and many guide services will not take a client higher who needs more than 6.5 hours. Camp Muir has a ranger hut, guide huts, toilets and a stone public shelter with bunks for about 20, open all year and unreservable; most climbers camp on the glacier, and the camp is limited to 110 people a night.
Summit day begins in the dark. The route crosses the Cowlitz Glacier and climbs through Cathedral Gap (3,290 m, 10,800 ft) to the Ingraham Flats camp (3,415 m, 11,200 ft), then traverses under the seracs of the Ingraham Glacier, the Icebox, and the rockfall zone called the Bowling Alley, where climbers should not stop for more than a few minutes. In 1981 an ice avalanche at the Icebox killed eleven people, the worst mountaineering accident in North American history; they are still in the glacier. The rocky crest of the Disappointment Cleaver, about 370 m of class 3–4 scrambling with wands to mark the way, leads to its top at 3,750 m (12,300 ft), the main turnaround point. Above it, the route zigzags between crevasses, often with ladders placed by guides, to the crater rim at Guide Rock (about 4,310 m) and across the crater to Columbia Crest. Guide services maintain and mark the route from mid-May to the end of September.
Emmons–Winthrop Glacier. The main route on the north-east side, first climbed in 1884, sees about 1,600 climbers a year with a success rate around 54%. It is longer (about 3,140 m of gain over 15–16 km) and less crowded, with no fixed handrails. From White River Campground the Glacier Basin Trail leads 5.6 km to the Inter Glacier, which climbs past Camp Curtis (2,650 m) to Camp Schurman (2,900 m, 9,500 ft), with a ranger hut and a toilet and a limit of 48 people. Above it the route follows Emmons Flats and a long ramp of the glacier known as the Corridor, then weaves through crevasses to the crater rim. Six to seven hours from Camp Schurman to the summit is typical.
More demanding routes include the Kautz Glacier and the remote Liberty Ridge on the north side; the Park Service publishes route briefs for each.
Permits, costs and rules
Anyone going onto a glacier or above the normal high camps, around 10,000 ft (3,050 m), must register and pay the climbing cost recovery fee: USD 82 per person (as of 2026), paid online at Pay.gov before arriving. From 1 May to 15 September overnight trips also need a wilderness permit at USD 12 per person per night. In summer about half of the capacity of each camp and zone is held for walk-up permits, issued at wilderness information centres up to 24 hours before the climb; the rest can be reserved in advance. Camp Muir allows 110 people a night (66 reservable spots), Camp Schurman 48. In winter climbers self-register at Paradise. Climbers must be 18 or have a guardian's permission, and solo climbing needs separate approval, which fewer than half of the roughly 200 applicants a year receive. A park entrance fee is charged separately.
- Three main concessioners hold permits to guide on the mountain: Alpine Ascents International, International Mountain Guides and Rainier Mountaineering Inc.; other companies operate with single-trip authorisations.
- All human waste must go into the toilets at the high camps or into "blue bags", which are handed out at ranger stations and dropped into barrels at Camp Muir, Paradise, Camp Schurman and White River.
- Rangers make evening rounds at the high camps in summer and give route and weather briefings.
When to go and weather
The main climbing season runs from mid-May, when guided climbs start, to the end of September. July and August are the most reliable months; June still has winter-like storms, and rangers advise warm double boots before early July. Rainier makes its own weather: cloud caps form on the summit quickly and without warning, and summer winds near the top average about 30 km/h (20 mph), with wind chills commonly between −21 and −12 °C. Precipitation and poor visibility are the conditions most likely to turn a climb into a rescue, and climbing into bad weather causes most accidents on the mountain. Paradise is one of the snowiest places on Earth: in the winter of 1971–72 it recorded 1,122 inches (28.5 m) of snow, a world record at the time.
Water
Above the trailheads there are streams on the approach trails in summer, notably along the Glacier Basin Trail, but on the climbing routes snow is the only source. At Camp Muir there is no running water: bring a stove and enough fuel to melt snow, and collect snow from the north side of Muir Ridge, because the toilets' urine drains run into the Muir Snowfield. The same care applies at Camp Schurman and Ingraham Flats. Plan for 3–4 litres per person on summit day, with an insulated bottle or a bladder with an insulated tube, and boil or treat any stream water lower down.
Mobile coverage and internet
Mount Rainier is better connected than most big mountains. The Park Service notes that mobile reception is available at most places above about 1,800 m (6,000 ft), though not everywhere, and coverage in the forested valleys is patchy. Rangers recommend carrying a phone in airplane mode with a spare battery to check forecasts, as well as GPS and a map and compass for navigation in whiteouts. The emergency number in the United States is 911; park rangers run search and rescue and can land the park helicopter at Camp Muir in good weather.
Altitude, dangers and safety
About 84 climbers died on Rainier between 1947 and 2018; the worst single accident was the 1981 Icebox avalanche. The commonest reason for turning back is fatigue from inadequate training, followed by weather. The main hazards are whiteouts on the Muir Snowfield, which account for most search and rescue operations on the south side, crevasse falls, steep icy slopes of 40–50°, serac and rockfall in the Icebox and Bowling Alley, and descending in the wrong direction from the featureless summit plateau. Most accidents happen on the way down. Climbers need glacier travel and crevasse rescue skills, an ice axe and crampons, and should carry a GPS track of their ascent. The altitude is high enough for altitude sickness, especially for climbers who come straight from sea level.
History and name
The peoples around the mountain have their own names for it, including the Lushootseed təqʷubəʔ, which was anglicised as Tacoma or Tahoma. On 8 May 1792 the British captain George Vancouver named it after his friend Rear Admiral Peter Rainier. In the late 19th century the city of Tacoma campaigned for the name Mount Tacoma, but the US Board on Geographic Names confirmed Rainier in 1890.
The first recorded ascent was made on 17 August 1870 by Hazard Stevens and P. B. Van Trump, who were greeted as heroes in Olympia. John Muir climbed it in 1888, and Camp Muir is named after him. Mount Rainier National Park was established by President William McKinley on 2 March 1899. During the Second World War soldiers of the 87th Mountain Infantry Regiment trained on the mountain and reached the summit by the Disappointment Cleaver in May 1942.
Interesting facts
- Camp Muir's guide hut of 1916 is the oldest stone building in the park, and its public shelter dates from 1921.
- Since 1950 more than 470,000 climbing attempts have been registered; numbers peaked at over 13,000 in 2000.
- Rainier is built of andesite lava. Active fumaroles keep a patch of the crater rim free of snow, and there, at Register Rock, the summit register is kept in a large metal box.
- The park protects over 1,000 species of plants and fungi and endemic animals such as the Cascade red fox.
FAQ
How high is Mount Rainier? 4,392 m (14,410 ft), the long-standing figure for Columbia Crest; recent surveys of the shrinking ice cap give about 14,400–14,406 ft (4,389–4,391 m).
How long does it take to climb Mount Rainier? Usually two to three days by the Disappointment Cleaver: 5–6 hours from Paradise to Camp Muir, then a summit day of about 10–12 hours from Camp Muir and back.
How difficult is Mount Rainier? It is a serious glacier climb: crevasses, slopes up to 40–50°, rockfall and serac danger. Climbers need rope, crampons, ice axe and crevasse rescue skills or a guide. About half of all climbers reach the summit.
How much does a climbing permit cost? The climbing cost recovery fee is USD 82 per person (2026), plus a USD 12 per person per night wilderness permit from 1 May to 15 September and the park entrance fee.
Is there water on the route? Only snow above the approach trails. Melt snow at Camp Muir from the north side of Muir Ridge, away from toilet drainage, and carry enough fuel.
Is there mobile coverage on Mount Rainier? Yes, at most places above about 1,800 m on the main south-side route, but not everywhere. The emergency number is 911.
When is the best time to climb Mount Rainier? From mid-May to September, with July and August usually the most stable months.
Is Mount Rainier dangerous as a volcano? It is an active volcano monitored by the USGS and rated a very high threat. The main hazard is lahars, which can be triggered by eruptions or by collapses of the weakened upper cone, and which have reached the Puget Sound lowlands in the past.