

| 2007-08 | Cloud Nine Express, Mammoth's second six-pack chairlift, replaces Chair 9. |
| 2007 | Top of the Sierra Interpretive Center opens on the summit of Mammoth Mountain. |
| 2005-06 | Most snow for the season, since 92/93 with 668 inches (56 feet). |
| 2005 | Main Lodge dining facilities are fully renovated and renamed Broadway Marketplace. |
| 2004 | Chair 17 is upgraded from a three-seater to a high-speed quad re-named Schoolyard Express, becoming the focal point of a new on-mountain learning area. Massive snowfall (607 inches) leads the the Ski Area to open two weeks before schedule in October and close July 4th, recording the second snowiest winter on record. |
| 2003 |
The Village, Mountain Center and Village Gondola officially open, providing more options and convenience for guests. |
| 2001 |
Mid Chalet is renovated and reopens as McCoy Station complete with new food court, restaurant and retail shop. |
| 2000 |
Eagle Express, first detachable six-pack at Mammoth, opens replacing Chair 15 and 24. Little Eagle Lodge opens as a temporary base facility. |
| 1999 |
8-passenger gondola complete on lower gondola, old 6-passenger gondola is retired. |
| 1998 |
Chair 4 replaced by Rollercoaster Express detachable quad, Gold Rush Express opens, Upper Panorama Gondola replaced with 8 passenger gondola, Mill Café opens. |
| 1997 |
Chair 18 removed, Chair 5 becomes a triple, Chair 2 replaced with detachable quad and renamed Stump Alley Express, Chair 6 and T-bar 2 replaced by detachable quad called Thunderbound Express, Chair 3 replaced by Face Lift Express detachable quad. |
| 1996 |
Eastern Sierra College Center, a branch of Cerro Coso Community College, opens with seed money from McCoy and the Mammoth Lakes Foundation. |
| 1996 |
Mammoth Mountain and Intrawest, the leader in mountain resort development, team up to realize Mammoth's long-term goal of becoming a world-class four-season mountain resort. |
| 1995 |
Hut 2 is renamed Canyon Lodge. |
| 1994-95 |
Longest season at Mammoth Mountain. Open from October 8, 1994 to August 13, 1995. |
| 1994 |
Chair 16 is upgraded to detachable quad, Chair 27 opens. |
| 1994 |
Mammoth Mountain installs elevated people mover to transport guests from Chair 2 to the Main Lodge sundeck. |
| 1992-93 |
Most snow since 68/69 with 617 inches (51 1/2 feet). |
| 1991 |
Snowmaking expands to cover Chair 1, 2, 3, 6, 11, 26 and the lower gondola. |
| 1989 |
Mammoth Mountain allows snowboarding on all slopes. |
| 1988 |
Chair 26 replaced T-bar, new detachable quad named Broadway Express replaces Chair 1. |
| 1986 |
Mammoth purchases nearby June Mountain. |
| 1985 |
Chair 24 and 25 open, Chair 2 is upgraded to quad. |
| 1984 |
Chair 7 replaced with a triple chair. |
| 1982 |
Chairs 22 and 23 open. |
| 1980 |
Chairs 20 and 21 open. |
| 1979 |
Chairs 17, 18 and 19 open. |
| 1976-77 |
Least snow for the season with 90 inches (7 1/2 feet). |
| 1975 |
Chairs 15 and 16 open. |
| 1973 |
Hut 2 (Canyon Lodge) opens. |
| 1972 |
Chairs 11, 12, 13 and 14 open. |
| 1970 |
Chair 10 opens. |
| 1969 |
"The Great Snow of '69" hit the Sierra dumping up to 25 feet of snow in just a few weeks burying the ski area. Rapid accumulation of snow and limited snow removal resources led to total burial of the main lodge with snow tunnels leading down from the surface to chair lifts and lodge entrances. |
| 1969 |
Chairs 7, 8, and 9 open. |
| 1966 |
First gondola to the top of the mountain opens. |
| 1965 |
Chair 6 and lower gondola opens. |
| 1965 |
Chair 5 opens. |
| 1962 |
Chair 4 opens. |
| 1959 |
Chair 3 opens. |
| 1956 |
Chair 2 (now called Stump Alley Express) opens. |
| 1955 |
Thanksgiving Day - Mammoth Mountain's first chairlift opens with eager skiers crowding in lift lines two to three hours long. |
| 1953 |
The first Main Lodge opens, nicknamed "The Pit". |
| 1953 |
Forest Service awards Dave McCoy permit to operate permanently on Mammoth Mountain on the condition that he develop the mountain. |
| 1948 |
McCoy gets a temporary special use permit for a permanent location, on today's Broadway, which supersedes his roving permits. The permit is year-to-year and may be revoked each year. |
| 1941 |
McCoy obtains roving permit for his own portable rope tow powered by a Ford Model "A" engine and started skiing Mammoth Mountain when weather allowed. |
| 1938 |
McCoy secures permit to operate permanent rope tow on McGee Mountain. He sells his Harley-Davidson for $85 to raise funds for equipment. |
| 1936 |
McCoy starts working for DWP as a snow surveyor and later hydrographer. |
| 1924 |
Original Tamarack Lodge building built by Pasadena heiress Mary Foy for entertaining her socialite and movie star friends. |
| 1915 |
Dave McCoy born in Los Angeles. |
| 1881 |
Much of Mammoth City destroyed by fire. |
| 1878-79 |
Mammoth City flourishes as a mining town. |
| 1878 |
Mammoth Mining Company was founded in Mammoth City. |
| 1857 |
German miners lost in the mountains find gold at the headwaters of the Owens Valley River. |