Mammoth Mountain is one of California's largest ski areas, with about 3,500 acres (1,416 hectares) on 180 runs and 3,100 ft (945 m) of vertical, from a 7,950 ft (2,424 m) base to an 11,050 ft (3,369 m) summit. Intermediate runs take 48% of the terrain, with 24% advanced, 15% beginner and 13% expert, so there is something for every level. The Panorama Gondola reaches the summit in about seven minutes, giving quick access to the upper mountain and its advanced alpine terrain, while Broadway Express serves as the primary beginner access from the Main Lodge.

Above the trees, Chair 23 serves steep chutes and exposed upper bowls, including Cornice Bowl, one of the mountain's classic steep descents. Chair 22 on Lincoln Mountain offers wind-sheltered expert runs, including the Avalanche Chutes, which are useful when wind closes the top. Hangman's is a famous run near McCoy Station, visible from the gondola along with Broadway and the Paranoids. Unbound Main Park anchors a system of ten terrain parks, two halfpipes and more than 100 jibs and 50 jumps. Mammoth suits families, park riders and experts after steep lines.

The 2025-26 season opened 20 November following snowmaking preparation and runs through 25 May 2026, with daily lift operations from 7:30am to 2:00pm during spring hours beginning in May. Mammoth typically operates from early November into June, with exceptional years extending into July or August. The 1994-95 season opened 8 October and closed 13 August, whilst 2017 closed 6 August and 2022-23 ran until 6 August following record snowfall. Season length averages over 200 days.

Annual snowfall averages 400 inches at base elevations, exceeding 10 metres total accumulation and rising past 500 inches at the 11,053-foot summit. The 2022-23 winter delivered over 700 inches at Main Lodge and nearly 900 inches at the summit. February and March historically produce the heaviest snowfall, with the first week of March averaging 43 centimetres. November typically receives 32 inches, whilst December through February each deliver 67 to 71 inches. Snowmaking covers 33% of terrain, establishing a reliable early-season base.

January and February offer peak powder conditions, whilst March balances fresh snow with increasing sunshine. April and May deliver spring corn snow under bluebird skies, with temperatures rising but coverage holding at altitude. The resort benefits from 300 days of annual sunshine. The 2025-26 season received 87 inches in February alone, securing a Memorial Day closing despite a slower early winter. Mammoth's east-side Sierra location captures Pacific storms whilst the 2,424-metre base elevation prevents rain.

Night of Lights returns 14 December annually at Canyon Lodge with fireworks and family activities. Elevation Mammoth gay ski week runs 12-16 March 2025. Ikon Pass holders receive Early Ups exclusive morning access on select dates with complimentary breakfast at McCoy Station. The resort does not offer night skiing but extends spring hours to maximise morning corn snow. Chair 1 banner breakthrough and opening day ceremonies feature Woolly the mascot and complimentary beverages.