is a United States National Park located in northwestern Wyoming, U.S. The Park consists of approximately 310,000 acres (130,000 ha) and includes the major peaks of the 40-mile (64 km) long Teton Range as well as most of the northern sections of the valley known as Jackson Hole. Only 10 miles (16 km) south of Yellowstone National Park, the two parks are connected by the National Park Service managed John D. Rockefeller, Jr. Memorial Parkway. These three protected areas in conjunction with surrounding National Forests constitute the Greater Yellowstone Ecosystem, which at almost 18,000,000 acres (7,300,000 ha), is one of the largest intact mid-latitude temperate ecosystems in the World.
Open Year-round, closed December 25
November 1, 2010 to April 30, 2011: 9 a.m. to 5 p.m.
May 1 to June 5: 8 a.m. to 5 p.m.
June 6 to September 25: 8 a.m. to 7 p.m.
September 26 to October 31: 8 a.m. to 5 p.m.