The Western States 100 is an annual ultramarathon held in California, covering a distance of 100.2 miles. It takes place in June and runs from Squaw Valley to Auburn, traversing the scenic Sierra Nevada mountains. The race is known for its challenging terrain, including steep climbs and rugged trails, attracting elite and amateur runners alike. Established in 1974, the Western States 100 is one of the oldest and most prestigious ultramarathons in the world. Runners must complete the course within 30 hours, with various aid stations providing support along the way. The event is part of the Ultra-Trail World Tour.