How Long Will Mammoth Stay Open 2024. The eastern sierra ski resort announced on march 21, 2023 it would stay open through july at least the seasonal snowfall has been substantial, with over. Nov 15, 2024 kicks off our 24/25 winter season.

These dates are subject to change at mammoth mountain’s discretion based on weather and snowfall. Due to the availability of tours and the length of each one, you will probably need at least two days.