Western States 100 (WS100)

The Western States 100 (WS100) is a prestigious ultramarathon that covers approximately 100 miles (160 km) through the Sierra Nevada foothills in California. Held annually since 1974, it challenges runners with tough terrain, including steep climbs, descents, and variable weather. Participants must navigate rugged trails, often over 24 hours, testing endurance, mental stamina, and strategy. The race starts in Squaw Valley and ends in Auburn, drawing elite ultrarunners and enthusiastic amateurs alike. Known for its rich history and camaraderie, WS100 is considered one of the most iconic and difficult ultramarathons in the world.