Mountain High covers about 290 acres (117 hectares) of the San Gabriel Mountains above Wrightwood, spread over East, West and North areas with 59 runs between them. The base sits near 6,600 ft (2,012 m) and the top reaches 8,200 ft (2,499 m), a vertical of 1,600 ft (487 m). Intermediates take 40% of the terrain, advanced runs 30%, beginners 25% and experts 5%. It is a compact mountain by Sierra standards, though the mix of quads, doubles, triples and surface lifts keeps laps quick and queues manageable on most days.

East Resort holds Goldrush, a 1.6-mile run billed as the longest in Southern California, plus the double black Olympic Bowl, the mountain's best mogul field. West Resort leans toward terrain parks and lit night sessions, while North Resort is mostly gentle slopes for first-timers. Expert skiers will run out of challenge within a day, because steep pitches are limited. Mountain High suits Los Angeles day-trippers, families starting out and park riders after a quick session, with enough cruising variety to keep intermediates entertained across all three areas.

Mountain High operates from late November through mid-March, with the 2025-26 season running 28 November 2025 to 15 March 2026. West Resort typically opens first in Southern California due to higher base elevation at 2133 metres and extensive snowmaking infrastructure, often operating before Thanksgiving. The season spans approximately 108 days, shorter than northern counterparts but reliable given comprehensive snowmaking coverage. Night skiing runs Wednesday through Sunday during peak periods, extending operational hours seven nights weekly when conditions allow.

The resort receives an average 3 metres of natural snowfall annually, with February historically delivering peak accumulation around week four of the month averaging 12 centimetres per snowfall event. Snowmaking covers more than 80 percent of terrain, enabling operations despite Southern California's Mediterranean climate and lower natural snow totals compared to Sierra Nevada resorts. The 2025-26 season recorded 112 centimetres of total snowfall by March. Elevation advantage at East and West summits approaching 2500 metres helps retain snow quality, whilst North Resort's reliance on natural snow limits operational days.

January through February offers optimal powder conditions following storm cycles tracking across Southern California, whilst March delivers spring corn snow and warmer temperatures. Weekday visits avoid weekend crowds that swell from Los Angeles and Orange County, with Thursday attracting locals for fresh snow before weekend tracking. December holiday periods from 20 December through 4 January rank as busiest, alongside Martin Luther King weekend and Presidents' Day weekend mid-February. Early-season November conditions depend entirely on snowmaking, with natural terrain limited until late December.

Oktoberfest runs weekends 4-19 October at West Resort, attracting thousands annually as Wrightwood's largest festival. Terrain park competitions including rail jams and freestyle events punctuate the calendar, whilst family programming features Easter egg hunts hiding $5,000 in prizes and discounts. The H2O Winter Surf/Snow Classic and various USASA sanctioned events draw competitive riders. Summer operations include disc golf on three nine-hole courses at North Resort, plus camping, events, and seasonal festivals, though mountain biking has paused as of 2026.