When will Cooper Pass ski resorts open for the ski season? The 2026/27 Ski season at Cooper Pass resorts starts from 01.11.2026. See this list of projected opening dates for Cooper Pass mountains. Important Note: Not all dates listed here are official and final, as resort opening dates are projected and subject to change. Check back for updates on when the lifts are set to start spinning at Cooper Pass resorts, and don't miss opening day at your favorite resort!