Mammoth Mountain is NOT a major ski resort in the Rocky Mountains; it is located in California's Sierra Nevada range.

While Mammoth Mountain is a popular ski resort, it is situated in California's Sierra Nevada, not the Rocky Mountains. In contrast, major ski resorts like Aspen, Vail, and Jackson Hole are found within the Rocky Mountain range, attracting winter sports enthusiasts from all over. Aspen is known for its luxurious atmosphere and diverse skiing options, catering to both beginners and advanced skiers. Vail boasts one of the largest ski areas in the United States, featuring an extensive network of trails. Jackson Hole is famous for its steep terrain and breathtaking scenery, making it a favorite among expert skiers.