Mammoth Opening Day 2025. What’s new in mammoth lakes and at mammoth mountain for winter 2024/2025 a new chairlift and infrastructure improvements at mammoth mountain, the opening of affordable housing, and updates to flight service. This will be the 71st season that the lifts are fired up and the slopes are ready to ride.
Below is a list of the open and closing dates we currently have. Fast and fun— mammoth opening weekend conditions report.