Estes Park (/ˈɛstɪs/) is a statutory town in Larimer County, Colorado, United States. The town population was 5,904 at the 2020 United States census. Estes Park is a part of the Fort Collins, CO Metropolitan Statistical Area and the Front Range Urban Corridor. A popular summer resort and the location of the headquarters for Rocky Mountain National Park, Estes Park lies along the Big Thompson River. Landmarks include The Stanley Hotel and The Baldpate Inn. The town overlooks Lake Estes and Olympus Dam.

Before Europeans came to the Estes Park valley, the Arapaho Native Americans lived there in the summertime and called the valley "the Circle." When three elderly Arapahoes visited Estes Park in 1914, they pointed out sites they remembered from their younger days. A photograph at the Estes Park Museum identified the touring party as Shep Husted, guide; Gun Griswold, a 73-year-old judge; Sherman Sage, a 63-year-old chief of police; Tom Crispin, 38-year-old reservation resident and interpreter; Oliver W. Toll, recorder; and David Robert Hawkins, a Princeton student.

In the 1850s, the Arapaho had spent summers camped around Mary's Lake, where their rock fireplaces, tipi sites, and dance rings were still visible. They also recalled building eagle traps atop Longs Peak to get the war feathers coveted by all tribes. They remembered their routes to and from the valley in detail, naming trails and landmarks. They pointed out the site of their buffalo trap, and described the use of dogs to pack meat out of the valley. Their recollections included a battle with Apaches in the 1850s, and fights with Utes who came to the area to hunt bighorn sheep, so all three of those tribes used the valley's resources.

Whites probably came into the Estes Park valley before the 1850s as trappers, but did not stay long. The town is named after Missouri native Joel Estes, who founded the community in 1859. Estes moved his family there in 1863. One of Estes' early visitors was William Byers, a newspaper editor who wrote of his attempted ascent of Longs Peak in 1864, publicizing the area as a pristine wilderness.

Griff Evans and his family came to Estes Park in 1867 to act as caretakers for the former Estes ranch. Recognizing the potential for tourism, he began building cabins to accommodate travelers. It became a dude ranch in Estes Park, with guides for hunting, fishing, and mountaineering; when Isabella Bird arrived in 1873, Evans already had nine men and women as guests.

The 4th Earl of Dunraven and Mount-Earl, a young Anglo-Irish peer, arrived in late December 1872 under the guidance of Texas Jack Omohundro, subsequently made numerous visits, and decided to take over the valley for his own private hunting preserve. Lord Dunraven's 'land grab' didn't work, but he controlled 6,000 acres before he changed tactics and opened the area's first resort, the Estes Park Hotel, which was destroyed by fire in 1911.

Bird, the daughter of an Anglican minister, came overland to Colorado, where she borrowed a horse and set out to explore the Rocky Mountains with a guide, the notorious James Nugent, aka 'Rocky Mountain Jim'. She wrote A Lady's Life in the Rocky Mountains, a memoir of their travels, including the breathtaking ascent of Longs Peak, where she was literally hauled up the steep pitches "like a bale of goods."

On June 19, 1874, Rocky Mountain Jim and neighbor Griff Evans (see above) had an argument. Having had bitter history with each other, Nugent and Evans hated each other and were deep personal rivals when it came to tour guiding tourists. The argument escalated until Evans blasted Jim in the head with his rifle shotgun. Evans then traveled to Fort Collins to file an assault charge against Nugent, but he was arrested and tried for first degree murder when Jim Nugent died on September 9, 1874, of the bullet wound. Evans was put on trial, but the case was soon dismissed due to the lack of witnesses to the shooting. On August 9, 1875, the Loveland court-house acquitted Evans of any charges in the case.