Alta is one of the oldest. It is just east of Salt Lake City.
the biggest ski resort in the us is big ski ski resort in Montana it is also the second biggest in north America
Snowmass, Colorado
Vail
The first ski resort in Canada and the 2nd in north America is Mont-Tremblant Quebec, opened in February 1939. source: http://www.monttremblantpropertyforsale.com/mont-tremblant-resort.HTML
Breckenridge
Whistler boasts over the biggest vertical drop in North America and ski season that stretches from early November to late May. Construction on the first ski resort started in 1966.
The Canyons ski resort is one of the top 10 ski resorts in North America and is located in Park City, Utah. It is known to be the largest ski resort in Utah and has 4 thousand acres of terrain for skiing with 19 chairlifts.
Some highly rated ski resorts near Breckenridge are Breckenridge and Colorado ski resorts. The Breckenridge ski resort is considered to be one of the top 10 ski resort in North America.
Whistler-Blackcomb..........actually Deer Valley, Utah has won the top spot in Ski Magazine for the last 2 years
Ski Brule is a ski resort located in Iron River, Michigan. It claims to the be the first resort to open and the last to close, and offers a wide range of events and activities as well as ski-ing.
Angel Fire Resort is a ski resort located in the Sangre de Cristo Mountains in New Mexico. This resort is one of the most favorable ski resorts in America. This resort is known for it's steep ski slopes.
Ski Beech Resort is located in Beech Mountain, North Carolina. You will be able to ski, mountain bike, snowboard and ice skate. They even offer live music.