This Event Took Place Sat. Apr 13, 2013


Entry into the 2016 race will be by lottery. Registration will be open from December 1-13, 2015 and lottery results will be posted on December 15.


An out-and-back circumnavigation of the Warm Springs arm of Lake Sonoma. Fairly rugged terrain, 86% single track trails. About 10,500 feet of climb. Limited to 400 runners. Nine aid stations, 14 hour time limit. Finisher's jacket, coolmax t-shirt, other cool swag.


The course is 86% single-track trail, 9% dirt fire roads, with the first 2.4 miles on pavement. The trail is consistently (some would say relentlessly) rolling with three significant climbs. There is about 10,500 feet of elevation gain and an equal amount of loss over the 50 miles. Trail quality is generally good; there are very few rocks and almost no roots. However, much of the trail is seldom used and so you can expect a lot of leaves and sticks on the trail. There are 12 creek crossings and most (and maybe all) of them will be wet.


Pacers are not allowed due to the difficulty of providing adequate aid. C’mon, you can run 50 miles without a pacer!

Refund Policy

50% refund if you withdraw by March 1. No refunds after March 1. Entries are not transferrable.

Wait List

If you are on the wait list, you will be notified by March 8 if we are able to take your entry. Your credit card will not be charged until you clear the wait list and accept a spot in the race.

Local time: 4:44 PM


John Medinger
Race Director

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