When will ski resorts in Cooper Pass open for the ski season? The 2023/24 Ski season in Cooper Pass starts from 2023/11/03. 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, and don't miss opening day at your favorite resort!