Due to active tectonic uplifting, Mount Logan is still rising in height. Before 1992, the exact elevation of Mount Logan was unknown and measurements ranged from 5,959 to 6,050 metres (19,551 to 19,849 ft). In May 1992, a GSC expedition climbed Mount Logan and fixed the current height of 5,959 metres (19,551 ft) using GPS.
Temperatures are extremely low on and near Mount Logan. On the 5,000 m high plateau, air temperature hovers around −45 °C (−49 °F) in the winter and reaches near freezing in summer with the median temperature for the year around −27 °C (−17 °F). Minimal snow melt leads to a significant ice cap, reaching almost 300 m (984 ft) in certain spots.
Mount Logan from the North East, as seen from Kluane Icefield
In 1922, a geologist approached the Alpine Club of Canada with the suggestion that the club send a team to the mountain to reach the summit for the first time. An international team of Canadian, British and American climbers was assembled and initially they had planned their attempt in 1924 but funding and preparation delays postponed the trip until 1925. The international team of climbers began their journey in early May, crossing the mainland from the Pacific coast by train. They then walked the remaining 200 kilometres (120 mi) to within 10 kilometres (6 mi) of the Logan Glacier where they established base camp. In the early evening of June 23, 1925, Albert H. MacCarthy (leader), H.F. Lambart, Allen Carpé, W.W. Foster, N. Read and Andy Taylor stood on top for the first time. It had taken them 65 days to approach the mountain from the nearest town, McCarthy, summit and return, with all climbers intact.
1977 Warbler Ridge. Dave Jones, Frank Baumann, Fred Thiessen, Jay Page (all from Canada) and Rene Bucher (Swiss) in 22 days.
1979 Northwest Ridge. Michael Down (CA), Paul Kindree, John Howe, Reid Carter and John Wittmayer climbed to the summit over 22 days, topping out on June 19.
1979 South-Southwest Ridge. Raymond Jotterand (CA), Alan Burgess, Jim Elzinga and John Laughlan reached the summit after 15 days of climbing on June 30 and July 1.
1987 an alpine-style attempt on the Hummingbird Ridge ended with the deaths of Catherine Freer (US), North America's strongest female alpinist, and David Cheesmond from South Africa and Canada, considered among the best alpinists in the world, when a snow cornice broke.
1992 June 6, an expedition sponsored by the Royal Canadian Geographic Society confirmed the height of Mount Logan using GPS. The leader was Michael Schmidt, with Lisel Currie, Leo Nadeay, Charlie Roots, J-C. Lavergne, Roger Laurilla, Pat Morrow, Karl Nagy, Sue Gould, Alan Björn, Lloyd Freese, Kevin McLaughlin and Rick Staley.
During the last few days of May 2005, three climbers from the North Shore Search and Rescue team of North Vancouver became stranded on the mountain. A joint operation by Canadian and American forces rescued the three climbers and took them to Anchorage, Alaska for treatment of frostbite.