2025 Western States 100. The run starts in olympic valley, california, near the site of the 1960 winter olympics, and ends 100.2 miles later in auburn, california. The eagerly awaited lottery for entry into the 2025 western states 100 took place on december 7, 2025.

The western states 100, or western states endurance run, is an iconic ultramarathon that takes place in california, usa, covering 100.2 miles through the sierra nevada mountain range. Each lottery applicant must be at least 18.