February 26, 1917 - Established (as 'Mount McKinley National Park'). Park was around 2,146,000 acres at that time. December 2, 1980 - Renamed Denali National Park and Preserve, park roughly tripled in size. Learn more about park history. Park: 4,740,091 acres (including 2,146,270 acres of Federally-designated Wilderness)