In California, seven areas are operating at least through Memorial Day: Alpine Meadows, Donner Ski Ranch, Mammoth Mountain, Sierra Summit, Squaw Valley, Heavenly and Mt. Baldy. Chairs will be turning at Alyeska, Alaska, Whistler/Blackcomb, British Columbia, and Timberline Lodge, Ore. In the Rockies, Colorado's Arapahoe Basin and Silverton and Utah's Snowbird will all be operating as well. \