Top Ten Ski Resorts in North America:

1. Jackson Hole, WY
2. Deer Valley, UT
3. Vail, CO
4. Sun Valley, ID
5. Park City Mountain Resort, UT
6. Whistler Blackcomb, B.C.
7. Telluride, CO
8. Steamboat, CO
9. Snowmass, CO
10. Canyons, UT

It is very difficult to rank ski resorts because they are so different in conditions. For example a resort like Jackson Hole is a lot higher up in the northern hemisphere then Deer Valley, therefor the climate is a lot different.