Six hours by car or one hour by plane from Los Angeles, Mammoth Mountain in the Eastern Sierra remains one of California's most popular ski destinations, with over 150 runs spread across more than 3,500 acres. Only 90 minutes from downtown Los Angeles, Mountain High in the San Gabriel Mountains offers skiers and snowboarders three distinct mini-resorts. Located 14 miles north, Mt. Baldy has an old school, glitz-free vibe and relies mostly on natural snow. It features six double black diamond runs among its more than 25 runs of varying difficulty, making it an attractive choice for advanced skiers.