• In 1920, rangers officially introduced the first interpretive programs in the park.
  • In 1923, the Yosemite Museum Association was established as the nation’s first ‘cooperating association’ with the National Park Service. Now known as the Yosemite Conservancy, it provides volunteer opportunities, outdoor learning, educational programs and fundraising support for the park.
  • In 1926, the Yosemite Museum opened – the first in the national park system.
  • In 1926, the all-year highway 140 opened.
  • On July 14, 1927, Yosemite Park and Curry Company opened the Ahwahnee Hotel.
  • In 1929, Indian Field Days ended.