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1922 Seven Sherpa climbers are killed in an avalanche, becoming the first reported deaths on Everest.
1922 The second British expedition reaches 8321 meters.
1924 The third British expedition reaches 8500 meters. On June 6, George Mallory and Andrew Irvine ascend to attempt to reach the summit but are lost after cloud closes in. An eyewitness claims seeing them near the summit.
1933 Lady Houston funds formation of aeroplanes to fly over summit to deploy the British Union Jack flag.
1934 Maurice Wilson (British) dies on attempting to climb alone.
1938 Mountaineering explorer Bill Tilman (British) leads an expedition via the north west ridge, reaching over 27,000 ft without oxygen before being forced down by foul weather.
1950 Nepal opens its borders to foreigners. Bill Tilman and Charles Houston undertake a reconnaisance expedition to Everest.
1952 A Swiss expedition, including Sherpa Tenzing Norgay gives up from exhaustion, 200 metres short of the summit.
1953 The summit was first reached at 11:30 am on May 29 by the New Zealander Sir Edmund Hillary and Sherpa Tenzing Norgay from Nepal climbing the South Col Route.。
1956 Swiss expedition climbed for the second time in the history of the Everest.
1960 On May 25, a Chinese team consisting of Wang Fuzhou, Gongbu and Qu Yinhua makes the first summit via the North Ridge.
1963 First crossing by a United States expedition, starting from the west and descending over the south-west.
1965 On May 20, Nawang Gombu Sherpa becomes the first person to reach the summit of Everest twice.
1975 On May 16, Junko Tabei of Japan is the first woman on the crest.
1978 Reinhold Messner (South Tyrol, Italy) and Peter Habeler (Austria) reach the summit without oxygen tanks.
1980 First winter expedition by a team from Poland.
1980 Reinhold Messner, first man to climb Everest alone and without oxygen tanks.
1982 On October 5, Laurie Skreslet becomes the first Canadian to reach the summit.
1984 First Australian expedition scales Everest. Expedition comprised of Tim Macartney-Snape , Greg Mortimer, Andy Henderson and Lincoln Hall, two of which (Macartney Snape and Mortimer) made it to the summit. It is known that had Hall attempted the summit, all members would have perished on the summit.
1988 Jean-Marc Boivin of France starts with a paraglider from the mountaintop.
1988 A team with members from China, Japan and Nepal climbed for the first time through the North and the South cols.
1990 Bertrand “Zebulon” Roche of France becomes the youngest westerner to climb Everest, age 17.