CA: Boreal, Bear Valley, Dodge Ridge, Squaw, Sugar Bowl, Donner, Homewood, Kirkwood, Iron Mountain (RIP).
Utah: Snowbird, Powder Mountain, Snobasin
Colorado: Berthoud Ski area (when it operated), Winterpark/Maryjane, Copper, Steamboat, Loveland, Abasin, Breck, Vail, Beaver Creek, Arrowhead, Snowmass, Aspen Highlands, Crested Butte, Monarch.
Utah: Hells Canyon, Handley(?) peak.
Colorado, Berthoud Pass, Monarch Pass, Butler Gulch, Rollins Pass, Wolf Creek Pass, Janet's Cabin, Lost Wonder Hut, Torrey's Peak, Grizzly Gulch, Quandary Peak, Buffalo Pass, Loveland pass, Vail Pass, Peak 1, Arapahoe Lakes, Geneva Basin.
That's just off the top of my head...