Mammoth Mountain Ski Area is a large ski resort in the western United States, located in eastern California along the east side of the Sierra Nevada mountain range in the Inyo National Forest.

[3] The ski area is located on the north side of Mammoth Mountain in the volcanic Long Valley Caldera.

Mammoth Mountain also has one of the longest ski seasons in North America, which averages from the start of November to Memorial Day.

The resort occasionally enjoys a longer season, as in 2016/2017, when it opened on November 8 and did not close until August 6th.

The 1994–95 season was Mammoth Mountain's longest, with the resort operating over ten months from October 8 until August 13.

Mammoth Mountain is a more popular destination than southern California ski resorts in the San Bernardino and San Gabriel Mountains, because of these areas' heavy reliance on snowmaking, coupled with significantly lighter winter precipitation and their notably shorter seasons.

Although Mammoth is physically closer to San Francisco and central valley cities than Los Angeles, most mountain passes along the Sierra crest are closed after the first major snowfall, and this lack of a trans-Sierra travel route creates an unusually long drive to Mammoth (6–8 hours) from the Bay Area and most of central California.

Scheduled passenger service, as of April 2024, is available to Eastern Sierra Regional Airport (BIH), about 45 min from Mammoth Lakes from San Francisco (SFO) and Denver International Airport (DEN) on a seasonal basis.

Mammoth was founded by Dave McCoy, a hydrographer for the Los Angeles Department of Water and Power.

The Village at Mammoth, a European-style and pedestrian-only complex, was built in a style similar to other Intrawest properties, such as Whistler in British Columbia or Keystone in Colorado.

[14][15] On February 23, 2005, Dave McCoy announced the pending sale of his stake in Mammoth Mountain, after 68 years of running the ski area.

On October 5, 2005, Mammoth announced that a majority stake will be sold to Starwood Capital Group, a private equity fund specializing in real estate, run by Barry Sternlicht.

The Mid-Chalet, which once had picnic tables on its roof, was completely remodeled in the early 2000s, renamed McCoy Station, and now features gourmet foods and a cafeteria.

The Mill Cafe, a small rustic bar and snack area was added in the early 2000s.