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Lake Sonoma 50

Saturday April 11th, 2026
Healdsburg, CA
Distance: 50 k · Ultra
Offical Race Web Site

The race is held on the rugged trails at Lake Sonoma, about 10 miles northwest of Healdsburg. The course is 86% single track and 9% dirt roads, with the first 2.4 miles on a paved country road.The race starts at 6:30 a.m. and has a 14-hour time limit.

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Lake Sonoma 50

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Lake Sonoma 50, Race Date: 2025-04-12, Distance: 50 k
Division Time Name Age Home
Male 6:50:31 Stephen Kersh 33 Seattle, WA US
2nd Male 6:52:36 Ryan Raff 25 Billings, MT US
3rd Male 6:53:25 Chris Myers 28 Nederland, CO US
4th Male 7:15:11 Hiroki Kai 30 Kashiwa, 12 JP
Female 7:36:21 Tara Dower 31 Durango, CO US
2nd Female 7:54:54 JANE MAUS 30 Salt Lake City, UT
3rd Female 8:07:16 Robyn Mildren 34 Baltimore, MD US
4th Female 8:17:40 Natalie Sandoval 32 Phoenix, AZ US
Division Time Name Age Home
Lake Sonoma 50

The course is an out-and-back circumnavigation of the Warm Springs Arm of Lake Sonoma. It is 86% single-track trail and 9% dirt fire roads, with the first 2.4 miles on pavement. The trail is 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 twelve creek crossings and it is likely that your feet will get wet in most – if not all – of them.


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