- Yellowstone National Park was established on March 1, 1872.
- Yellowstone is the world’s first national park.
No area figures have been scientifically verified. Efforts to confirm the park’s total area continue.
- 3,472 square miles (8,991 km2)
- 2,221,766 acres or 899,116 hectares.
- 63 air miles north to south (102 km)
- 54 air miles east to west (87 km)
- 96% in Wyoming, 3% in Montana, 1% in Idaho
- Highest Point: 11,358 feet (3,462 m; Eagle Peak)
- Lowest Point: 5,282 feet (1,610 m; Reese Creek)
- Larger than Rhode Island and Delaware combined
- About 5% covered by water; 15% by grassland; and 80% by forests
- Annual precipitation ranges from 10 inches (26 cm) at the north boundary to 80 inches (205 cm) in the southwest corner. Learn more about weather in Yellowstone.
- Record High: 99ºF (37ºC), 2002 (Mammoth Hot Springs)
- Record Low: -66ºF (-54ºC), 1933 (West Entrance, Riverside Station).
- Average daily at Mammoth Hot Springs: January: 9ºF (-13ºC); July: 80ºF (27ºC)
- Learn more about weather in Yellowstone.
- Elevation: 7,733 feet above sea level
- 131.7 square miles of surface area (341.1 km2)
- 141 miles of shoreline (227 km)
- 20 miles north to south (32 km)
- 14 miles east to west (22 km)
- Average depth: 138 feet (42 m)
- Maximum depth: 430 feet (131 m)
- Learn more about Yellowstone Lake
- The park sits on top of an active volcano.
- One of the world’s largest calderas at 45 x 30 miles (72 x 48 km)
- 1,000–3,000 earthquakes annually
- More than 10,000 hydrothermal features
- More than 500 active geysers (more than half the world's geysers)
- About 290 waterfalls
- Tallest waterfall near a road: Lower Falls of the Yellowstone River at 308 feet (94 m)
- 67 species of mammals, including seven species of native ungulates and two species of bear
- 285 species of birds (150 nesting)
- 16 species of fish (five nonnative)
- More than seven aquatic invasive species (three having significant detrimental effect)
- Five species of amphibians
- Six species of reptiles
- Two threatened species: Canada lynx, grizzly bears
- 26 associated Native American tribes
- More than 1,800 known archeological sites
- More than 300 ethnographic resources (animals, plants, sites)
- 25 sites, landmarks, and districts on the National Register of Historic Places; many more eligible for listing
- One National Historic Trail (Nez Perce)
- More than 900 historic buildings
- More than 720,000 museum items, including 30 historic vehicles
- Millions of archived documents
- More than 20,000 books (many rare), manuscripts, periodicals
National Park Service (December 2017)
- Permanent: 362 total
- Full time, year-round: 189
- Career seasonal: 169
- Part-time: 4
- Term (variable duration): 12
- Seasonal: 406
About 3,200 people work for concessioners in Yellowstone at summer peak.
Roads & Trails
- Five park entrances
- 466 miles (750 km) of road (310 miles [499 km] paved)
- More than 15 miles (24 km) of boardwalk, including 13 self-guiding trails
- Approximately 1,000 miles (1,609 km) of backcountry hiking trails
- 92 trailheads
- 301 backcountry campsites
Fiscal Year 2017 (in millions)
- Congressional Annual Appropriations: Operations and staff (base): $39.7
- Wildland Fire: $1.2
- Other Appropriations: $5.4
- Donations and Grants: $2.3
- Fees: $17.1
- Utilities & Agreements (Reimbursable): $1.9
Distribution of Budget
- Administration: 5% Includes human resources, contracting, budget and finance, property management, telecommunications and information technology
- Facility Operations and Maintenance: 53% Includes utilities, roads, trails, structures, historic preservation coordination, construction management
- Resource Protection: 19% Includes research and monitoring of natural and cultural resources, invasive species management
- Visitor Services: 23% Includes interpretation and education, law enforcement, emergency medical services, search and rescue, entrance station operations, structural fire activities, and park concessions management
- Yellowstone hosts around four million visits each year. More than half of these visits happen during June, July, and August.
- The last time the park recorded fewer than 3 million annual recreational visits was in 2006, with 2.87 million visits.
- Detailed park statistics are available at https://irma.nps.gov/Stats/
Top 10 Visitation Years
- 2016: 4,257,177
- 2017: 4,116,524
- 2015: 4,097,710
- 2010: 3,640,184
- 2014: 3,513,484
- 2012: 3,447,727
- 2011: 3,394,321
- 2009: 3,295,187
- 2013: 3,188,030
- 2007: 3,151,343
Read answers to many frequently asked questions.