Intrawest Corporation acquired a stake in the 1990s, leading to real estate development, including The Village at Mammoth.

Its last magmatic eruption occurred about 50,000 years ago, and it is surrounded by over 35 mafic vents with recent volcanic unrest linked to a 1989 dike intrusion.

[4] In April 2006, three members of the Mammoth Mountain ski patrol team died after falling into a volcanic fumarole near the summit during safety operations.

The east (22%) and west (10%) aspects offer varied exposure, while the minimal south-facing terrain (3%) sees the most variable conditions.

Mid-Chalet, Outpost, and The Mill serve as key on-mountain spots for dining, relaxation, and access to trails.

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 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.

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

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

[19] Additionally, Mammoth Mountain serves as a training site for elite snowboarders due to its extensive terrain parks and consistent snowfall.

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.

Most mountain passes along the Sierra crest are closed after the first major snowfall, and this lack of a trans-Sierra travel route creates a long drive to Mammoth (6–8 hours) from the Bay Area and most of central California.

[29] Sierra Pacific previously operated scheduled passenger flights with turboprop aircraft between Mammoth Lakes and Burbank, Fresno, Los Angeles and Las Vegas.On April 6, 2006, three ski patrollers at the ski area perished either due to a fall or combination of CO2 and hydrogen sulfide (H2S) poisoning.

Four patrollers, including John "Scott" McAndrews and James Juarez, were raising the fence around the fumarole, which had become buried due to heavy snowfall.

The oxygen masks used by the Mammoth Mountain ski patrol did not properly seal, allowing hazardous gases to come in.

One patroller was extracted and found responsive, while the other sustained serious injuries and was transported to Mammoth Hospital before being flown out for further care.