When will ski resorts in Mountain Collective open for the ski season? The 2023/24 Ski season in Mountain Collective starts from 2023/06/10. 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, and don't miss opening day at your favorite resort!