Saturday, Apr 13, 2019 @ 6:30 AM

Lake Sonoma

3400 Skaggs Springs Road

Healdsburg, CA 50 Miler

Registration closes: Sat, Dec 15 @ 11:59 PM

2019 Entry

LOTTERY OPEN NOW! Entry for the 2019 Lake Sonoma 50 is by lottery. Applications to the lottery will be open from December 1-15, 2018. The lottery will be held on December 16 and results will be posted immediately thereafter.

Elite runners seeking entry should contact the Race Director Skip Brand at


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.

Local time: 6:12 AM


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