The Western States Endurance Run is one of the oldest ultra trail events in the world and certainly one of the most challenging.

2010 Participant Guide

The Run is conducted along the Western States Trail starting at Squaw Valley, California, and ending in Auburn, California, a total of 100 miles. The trail ascends from the Squaw Valley floor (elevation 6,200 feet) to Emigrant Pass (elevation 8,750 feet), a climb of 2,550 vertical feet in the first 4½ miles. From the pass, following the original trails used by the gold and silver miners of the 1850’s, runners travel west, climbing another 15,540 feet and descending 22,970 feet before reaching Auburn.

Most of the trail passes through remote and rugged territory, accessible only to hikers, horses and helicopters.

WSER is a key event that has helped Auburn, CA, earn the title of "Endurance Capital of the World."

Due to the remoteness and inaccessibility of the trail, the Western States Endurance Run differs substantially from other organized runs. Adequate mental and physical preparation are of utmost importance to each runner, for the mountains, although beautiful, are relentless in their challenge and unforgiving to the ill-prepared.

The Run begins at 5:00 am on Saturday of the last weekend in June at the west end of Squaw Valley. Runners must reach the finish line no later than 11:00 am the following day in order to be eligible for an award.

Approximately 1,500 dedicated volunteers help out at each Western States Endurance Run. They are truly the life-blood of the Run and will do everything possible to make your day a success. Many spend more hours out on the trail than do the runners themselves.

More about the WS Run and its history.

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