History of Yellowstone Timeline

(11,000 years ago – Present)

Yellowstone National Park, established in 1872 as the world's first national park, spans Wyoming, Montana, and Idaho. Its history includes massive prehistoric volcanic eruptions that formed the Yellowstone Caldera, thousands of years of habitation by Native American tribes, early exploration by fur trappers and the 1869-1870 expeditions, its designation as a protected park by President Ulysses S. Grant, the creation of the National Park Service in 1916, ecological restoration efforts such as the 1995 reintroduction of gray wolves, and its continued role as a center of conservation and geothermal wonder. More Less

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Indigenous Presence

Sheepeater Shoshone occupy Yellowstone's high country

1000 - 1879

The Sheepeater band of the Eastern Shoshone (the Tukudika) lived year-round in the mountainous areas around Yellowstone, hunting bighorn sheep and fishing the region's rivers until they were removed to reservations in the late 1870s.

Image source: Tukudeka

Nez Perce flee through Yellowstone

Aug 1877

During their flight toward Canada, roughly 800 Nez Perce under Chief Joseph crossed Yellowstone National Park, encountering tourists in several incidents. The episode underscored that Native peoples still traveled traditional routes through the region.

Image source: Nez Perce War

Exploration and Discovery

John Colter explores the Yellowstone area

1807 - 1808

Fur trapper John Colter, a veteran of the Lewis and Clark Expedition, became the first known European American to enter the Yellowstone region. His accounts of steaming geysers and boiling springs were so fantastic that skeptics mockingly called it 'Colter's Hell.'

Image source: John Colter

Osborne Russell describes Yellowstone wonders

1836

Mountain man Osborne Russell kept detailed journals of his trapping expeditions in the Yellowstone country during the 1830s, providing some of the earliest written descriptions of the region's geysers, lakes, and abundant wildlife.

Raynolds Expedition surveys the region

1859 - 1860

Captain William F. Raynolds led an Army survey intended to explore the Yellowstone region, but deep snow in the passes prevented his party from entering the plateau itself. The expedition nonetheless mapped much of the surrounding territory.

Image source: Raynolds Expedition

Cook–Folsom–Peterson Expedition reaches Yellowstone Lake

Sep 1869

A small private party of three explorers from Montana ventured into Yellowstone, reaching Yellowstone Lake and documenting the geyser basins. Their published account helped inspire larger official expeditions to follow.

Image source: Cook–Folsom–Peterson Expedition

Washburn–Langford–Doane Expedition explores Yellowstone

Aug 22, 1870

Led by Surveyor General Henry D. Washburn and including Nathaniel P. Langford, this expedition spent over a month exploring Yellowstone, naming features such as Old Faithful and Mount Washburn. Members discussed the idea that the land should be preserved rather than privately exploited.

Image source: Washburn–Langford–Doane Expedition

Hayden Geological Survey maps Yellowstone

1871

Geologist Ferdinand Vandeveer Hayden led a comprehensive government-sponsored scientific expedition through Yellowstone with photographer William Henry Jackson and painter Thomas Moran. Their stunning images and reports convinced Congress of the region's extraordinary value.

Image source: Hayden Geological Survey of 1871

Park Establishment

Nathaniel Langford serves as first park superintendent

1872 - 1877

Langford was appointed unpaid superintendent but visited the park only twice, leaving it largely unprotected from poachers and vandals. His tenure highlighted the need for real enforcement and funding in the new park.

Image source: Nathaniel P. Langford

Yellowstone National Park established as world's first national park

Mar 1, 1872

President Ulysses S. Grant signed the Act of Dedication, establishing Yellowstone as the first national park in the United States and the world, setting aside more than two million acres 'for the benefit and enjoyment of the people.'

Image source: Yellowstone National Park

Philetus Norris becomes second superintendent

1877 - 1882

Norris aggressively explored and mapped the park, built its first road network, and secured congressional funding and paid staff, dramatically improving administration though poaching continued unchecked on park borders.

Image source: Philetus Norris

US Cavalry takes charge of protecting Yellowstone

1886 - 1918

After civilian management failed to stop poaching and vandalism, the US Army established Fort Yellowstone at Mammoth Hot Springs. Soldiers patrolled the park for three decades, dramatically reducing lawlessness and developing management practices later adopted by the National Park Service.

Image source: Fort Yellowstone

Mammoth Hot Springs headquarters established at Fort Yellowstone

1891

The Army constructed permanent facilities at Mammoth Hot Springs, including barracks and administrative buildings. This historic district later served as park headquarters and is now a National Historic Landmark District.

Conservation and Wildlife

Last great bison herds reduced to dozens in Yellowstone

1894

By the early 1890s, rampant market hunting had reduced Yellowstone's once-vast bison herds to fewer than fifty animals, prompting urgent protection efforts that eventually enabled the species' remarkable recovery within the park.

Image source: Yellowstone bison herd

Poacher Ed Howell's arrest sparks Lacey Act

1894

Army scout Burgess caught poacher Ed Howell slaughtering bison in the park, and the national outrage prompted Congress to pass legislation strengthening legal protection of Yellowstone's wildlife, a precursor to broader federal conservation laws.

Image source: Lacey Act of 1900

Great Fire of 1988 burns one-third of Yellowstone

Jun 14, 1988 - Sep 11, 1988

The largest wildfire complex in Yellowstone's recorded history scorched nearly 800,000 acres, about 36 percent of the park. The fires transformed forest policy nationwide and demonstrated the resilience of lodgepole pine ecosystems, which regenerated vigorously in the following decades.

Image source: Yellowstone fires of 1988

Wolves reintroduced to Yellowstone

Jan 12, 1995

After a seventy-year absence, gray wolves were captured in Canada and released into Yellowstone, restoring a keystone predator. The reintroduction triggered trophic cascades that reshaped elk behavior, willow growth, and river ecology, becoming one of conservation's most celebrated success stories.

Image source: History of wolves in Yellowstone

Bison management plan sparks ongoing controversy

2000

Federal and state agencies adopted a bison management plan addressing brucellosis transmission concerns, leading to controversial hazing and culling of bison migrating out of the park. Debates continue over expanding tribal and public hunting opportunities outside park boundaries.

Image source: American bison hunting

Grizzly bears removed from endangered species list

2007

The Greater Yellowstone grizzly population, which had dwindled to about 136 bears when listed in 1975, recovered sufficiently for federal delisting. Subsequent legal challenges caused relisting and delisting cycles, reflecting ongoing debates about managing the recovering population.

Image source: Grizzly bear

Modern Management

Old Faithful Inn completed

1903 - 1904

Architect Robert Reamer designed the massive log hotel near Old Faithful Geyser, creating an icon of rustic 'parkitecture.' The seven-story structure remains one of the largest log buildings in the world and a National Historic Landmark.

Image source: Old Faithful Inn

Grand Loop Road system completed

1905

Engineers completed the figure-eight Grand Loop Road, linking all major attractions—geysers, canyons, lakes, and wildlife valleys—and establishing the circulation pattern visitors still use today across the vast park.

Image source: Grand Loop Road

First automobiles admitted into Yellowstone

Jul 31, 1915

After decades of horse-drawn stagecoaches, the park opened its roads to automobiles. The change transformed tourism, rapidly increasing visitation and requiring major road improvements throughout the following decades.

National Park Service created

Aug 25, 1916

Congress established the National Park Service under Secretary of the Interior to provide unified management of national parks and monuments. The following year the NPS took over Yellowstone from the US Army, professionalizing park stewardship nationwide.

Image source: National Park Service

Yellowstone Lake earthquake swarm damages structures

1959

The magnitude 7.2 Hebgen Lake earthquake just west of the park triggered landslides, killed 28 people, formed Quake Lake, and altered geyser activity throughout Yellowstone, reminding scientists of the region's intense geological dynamism.

Image source: 1959 Hebgen Lake earthquake

Yellowstone caldera identified as supervolcano

1965

Scientists recognized that Yellowstone sits atop an enormous volcanic hotspot with three cataclysmic eruptions over the past two million years. Ongoing monitoring by the Yellowstone Volcano Observatory tracks seismicity, ground deformation, and hydrothermal changes.

Image source: Yellowstone Caldera

Yellowstone designated International Biosphere Reserve

1976

UNESCO designated Yellowstone a Biosphere Reserve, recognizing the Greater Yellowstone Ecosystem as one of the world's most intact temperate ecosystems and encouraging international cooperation in its scientific study and preservation.

Image source: World Network of Biosphere Reserves

Yellowstone inscribed as UNESCO World Heritage Site

1978

Yellowstone was among the first sites inscribed on the UNESCO World Heritage List, acknowledged for its exceptional geothermal features, wildlife, and role as the prototype of the global national park movement.

Image source: List of World Heritage Sites in the United States

Winter use snowmobile controversy begins

1990

Rising winter snowmobile visitation sparked decades of litigation and rule changes over air pollution, noise, and wildlife impacts, ultimately resulting in restrictions favoring guided snowcoach access and cleaner technology.