Opening Day Mammoth 2025. Projected opening dates (weather & conditions permitting) for many mono county winter activities: Of facilities to serve guests, including public.

The 2024/25 ski season in california starts from 2024/11/15. Mammoth mountain, one of california’s crown jewel ski resorts, has just confirmed to powder that they will open on friday, november 15 for the winter ’24/’25 season.