When will Powder Alliance ski resorts open for the ski season? The 2025/26 Ski season at Powder Alliance resorts starts from 09-11-2025. See this list of projected opening dates for Powder Alliance 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 Powder Alliance resorts, and don't miss opening day at your favorite resort!