The mountain was named "Hadon Peak" in 1888 by mountaineer Harold Ward Topham for Mr. and Mrs. Henry E. Haydon.[5] Henry Haydon was Secretary of the District of Alaska at the time of Topham's expedition to Mount Saint Elias.[2] Topham's failed 1888 expedition only reached an elevation of 11,460-feet on Mt. Saint Elias' south side,[6] so a close view of Haydon Peak was possible.[7] The mountain's toponym was officially adopted in 1917 by the U.S. Board on Geographic Names.[2]
Climate
Based on the Köppen climate classification, Haydon Peak is located in a tundra climate zone with long, cold, snowy winters, and cool summers.[8] Weather systems coming off the Gulf of Alaska are forced upwards by the Saint Elias Mountains (orographic lift), causing heavy precipitation in the form of rainfall and snowfall. Winter temperatures can drop below −10 °F with wind chill factors below −20 °F. This climate supports several glaciers surrounding this peak. The months May through June offer the most favorable weather for viewing or climbing.