Skier Conor Crowley makes his way down a trail at Aspen Mountain in 2016. The resort is one that can be accessed by Alterra's new Ikon Pass. (Nathan Hahn, Special to The Colorado Sun)

Alterra expects to sell 250,000 Ikon Passes, Vail Resorts says Epic Pass sales are up

Analysts are watching sales by the two Colorado-based resort giants for clues about the health of the North American ski industry.

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