As South Korea’s tallest mountain, and the sacred mountain of Korean people, Hallasan was designated a natural reserve in 1966 and a national park in 1970. Hallasan was also designated a UNESCO Biosphere in 2002, a UNESCO World Natural Heritage in 2007, and the Mooljangori Oreum was designated a Ramsar Wetland in 2008 and is now a protected area.

• Oct. 13.  2008. : Muljangori Oreum registered as a Ramsar Wetland
• Mar. 05. 2008 : Administrative organization reformed (Jeju-do Ordinance No. 324)
  Headquarters for Jeju World Natural Heritage Management, Protection and Management Department of Hallasan National Park 
• Apr. 21 2008. Opening of Hallasan National Park Visitors Center
• June. 27. 2007: Registered as a UNESCO World Natural Heritage (Jeju Volcanic Island and Lava Tubes)
• Jul. 01. 2006: Hallasan Research Institute separated and reorganized as an independent organization (Jeju-do Administrative Organization Establishment Ordinance No.2620)
• Oct. 14. 2003: Founding of  Research Institute for Mt.Halla (Jeju-do Regulation No. 1928)
• Dec. 16. 2002.: Designated as UNESCO Jeju Biosphere Reserve
• Jan. 15. 2001: Opening of Hallasan Research Institute, under Jeju-do Hallasan National Park Control Office (Jeju-do    Instruction No. 743)
• Sep.14 1998. Reorganization of Hallasan National Park Management Office (Jeju-do Reorganization Regulation No. 1771)
• Apr. 07. 1995: Opening of Gwaneumsa  Campground
• Aug. 07. 1987: Expansion of the Management Office organization (Jeju-do Ordinance No. 1348)
• Sep. 01. 1973: Opening of the Management Office (Jeju-do Ordinance No. 457)
• Mar. 24. 1970.: Designated as a national park (Ministry of Construction Announcement No. 28)
• Oct. 12. 1966: Designated as a natural reserve (Natural Monument No. 182)