Usually yes, depending on the weather.
Park City usually schedules the opening day for Thanksgiving or a few days earlier. However that would depend on weather conditions. Deer Valley resort usually opens early December. Alta and Snowbird follow rhe same rule. If weather cooperates they open on Thanksgiving day or anyday after. Most of resorts are open early December.
In 2017, opening day at PCM was 11/17 and Canyons was 11/22
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