Western States Endurance Run in Auburn
The Western States Endurance Run is a 100.2-mile trail race from Olympic Valley to Auburn, California, held each late June with roughly 18,000 feet of cumulative elevation gain. Its origin traces to 1974, when Gordy Ainsleigh ran the Tevis Cup horse-race route on foot, and the modern race, first held officially in 1977, remains one of the oldest and most prestigious 100-mile trail events in the world.
It is one of the world's most important ultrarunning events.