Denali (Mount McKinley): Facts About North America's Tallest Mountain

Mount McKinley, Denali
Mount McKinley, also called Denali, is the tallest mountain in North America.
Credit: Galyna Andrushko | Shutterstock

Mount McKinley in Alaska is the tallest mountain in North America. Its peak is 20,237 feet (6,168 meters) above sea level, also making it the third highest of the Seven Summits — the highest mountains on each of the seven continents — following Mount Everest in Nepal and Aconcagua in Argentina. By one measure, it could be considered the third tallest mountain in the world.

The native Athabascan people call the mountain Denali, meaning "The Great One." A gold prospector, William Dickey, named it Mount McKinley in 1896, after President William McKinley. Dickey was among a large group of prospectors who were part of the Cook Inlet gold rush. When asked why he chose to name the mountain after then-presidential nominee McKinley, he cited McKinley’s support of the gold standard. McKinley, who was from Ohio, never visited his namesake mountain or any part of Alaska.

There have been a number of efforts to switch the name back to Denali. Hudson Stuck, who made the first ascent of the mountain in 1913, wrote a book titled "The Ascent of Denali." In the preface of the book, he called for "the restoration to the greatest mountain in North America of its immemorial native name."

The park in which the mountain resides was established as Mount McKinley National Park on Feb. 26, 1917. While the park was tripled in size and renamed Denali National Park and Preserve in 1980, the mountain’s official name remains Mount McKinley.

More than 400,000 people visit the park each year, primarily between May and September. An estimated 32,000 people have attempted to reach the summit, with about a 50 percent success rate. There are many guides who lead climbing trips to Mount McKinley, and it is classified as an extremely challenging expedition due to the severe weather and difficulty in acclimating.

Where is Mount McKinley?

Mount McKinley is about 170 miles (275 km) southwest of Fairbanks and about 130 miles (210 km) north-northwest of Anchorage. It is part of the Alaska Range and the centerpiece of Denali National Park.

While it has long been believed that the Alaska Range, which spans much of south-central Alaska, was formed by tectonic activity, it has remained a mystery until recently because it is more than 300 miles (500 kilometers) from Alaska's southern coast, the closest source of mountain-building activity. A recent 3D computer model project shed some light on how the low angles and unusual bent in a geological fault further inland combined to form the mountain range.

How tall is Mount McKinley?

Until recently, the mountain’s official height was 20,320 feet (6,194 meters) above sea level, which had been established in 1952. However, a survey conducted in 2010 using advanced radar technology and made public in September 2013, pegged McKinley’s elevation as 20,237 feet (6,168 meters), shrinking it by 83 feet (26 meters). Alaska's Lt. Gov. Mead Treadwell made the height change official.

There is a distinction between measuring "highest" and "tallest." The highest mountain is determined by measuring a mountain's highest point above sea level. The tallest mountain is measured from base to summit. Using that measurement, Mount McKinley is taller than Mount Everest. McKinley rises about 18,000 feet (5,500 meters) from its base, which is a greater vertical rise than Mount Everest’s 12,000-foot rise (3,700 meters) from its base at 17,000 feet (5,200 meters).

In his book, "The Finest Peaks: Prominence and Other Mountain Measures" (Trafford, 2005), Adam Helman wrote, "The base to peak rise of Mount McKinley is the largest of any mountain that lies entirely above sea level." Based on its topographic prominence, or the distance between its summit and lowest contour line, McKinley is the third most prominent peak after Mount Everest and Aconcagua.

But McKinley and Everest are both dwarfed by Mauna Kea in Hawaii. When measured from the ocean floor to its summit, that mountain is 33,476 feet (10,204 meters) tall. Hoeever, only 13,803 feet (4,207 meters) rise above sea level.

Mount McKinley’s climate

The upper half of Mount McKinley is permanently covered with snow and many glaciers, some more than 30 miles (48 km) long. The mountain’s extreme cold, which can be minus 75 F (minus 60 C) with wind chill down to minus 118 F (minus 83 C), can freeze a human in an instant. An automated weather station at 18,700 feet (5,700 meters) records temperatures.

Climbers often find it hard to acclimate on the mountain. Because of its far northern latitude of 63 degrees, Mount McKinley has lower barometric pressure than the world’s other high mountains.

Key dates in Mount McKinley’s history

1794: British explorer George Vancouver refers to Denali in his journal.

1902: A mapping expedition led by geologist Alfred Brooks explores the area.

1903: Judge James Wickersham and four team members make it as far as the 10,000-foot (3,048-meter) mark, which is now known as Wickersham Wall.

1906: Physician and explorer Frederick Cook claimed to have reached the summit, but this assertion was discredited, as was his claim to have reached the North Pole in 1908.

1913: Hudson Stuck, Walter Harper, Harry Karstens and Robert Tatum are the first to reach the south summit.

1932: Bush pilot Joe Crosson lands the Cosmic Ray Party at 5,700 feet (1,524 meters) on the Muldrow Glacier. This expedition sees the first two known fatalities on the mountain. More than 100 climbers have perished on the mountain since.

1947: Barbara Washburn becomes the first woman to summit Mt. McKinley.

1960: The first topographic map of Mount McKinley is published by Bradford Washburn. The first party to camp on the mountain is a Meiji University team.  

1967: The first successful winter ascent is accomplished by Art Davidson, Dave Johnston and Ray Genet.

1970: The first solo ascent (Naomi Uemura); first all-female ascent; and the mountain's first ski descent are recorded.

1982: The first woman to complete a solo climb is Dr. Miri Ercolani.

1988: Vernon Tejas is the first solo climber to ascend Mt. McKinley in the winter and survive.

1993: Joan Phelps is the first blind climber to reach the ascent.

1995: Merrick Johnston, 12, is the youngest female to summit.

2001: Galen Johnston, 11, becomes the youngest male to reach the summit, Toshiko Uchida, 70, becomes oldest woman to summit.

2013: Alaska resident Tom Choate, 78, breaks the record as the oldest male to reach the summit.

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Kim Ann Zimmermann

Kim Ann Zimmermann is a contributor to Live Science. She holds a bachelor’s degree in communications from Glassboro State College.
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