When Does Mammoth Close 2025 Season. Mammoth confirmed today via social media that memorial day, monday, may 27, 2025 will be the final day of the winter '23/'24 season. To improve your experience, we're transitioning all of our venues to cashless payments.
Starting this winter season (24/25), mammoth & june mountains are going cashless. Hours of operation are subject to change based on conditions or weather.