When will Mountain Collective ski resorts open for the ski season? The 2025/26 Ski season at Mountain Collective resorts starts from 2025/06/13. See this list of projected opening dates for Mountain Collective 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 Mountain Collective resorts, and don't miss opening day at your favorite resort!