Lake Sonoma 100K
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Lake Sonoma 100K, 50K and Trail Sisters Half Marathon
The event takes place at Lake Sonoma in early April 2027 and features three trail races around the lake and surrounding hills. The 100k and 50k start and finish at the Lake Sonoma Visitor Center. The Trail Sisters Half Marathon starts at the Lone Rock parking area and finishes at the Visitor Center; a shuttle returns finishers to Lone Rock.
Race distances
- 100k Western States qualifier with a sub 19 hour standard for 2028 qualification
- 50k Includes a crossing of the iconic Lake Sonoma bridge
- Trail Sisters Half Marathon Women only, point to point, 5 hour cutoff
Course highlights include a summit at Pritchett Peak with sunrise views, stretches through madrone groves, sections of the original 50 mile out and back course, and extensive lake views. Organizers provide staffed aid stations along the courses and give finishers a custom bottle of wine from Wilson Winery as the event award.
Weekend activities are scheduled around the races, including a Thursday shakeout run, an athlete panel and community dinner on Friday, and a Sunday celebration social with wine tastings at Coyote Sonoma. Practical details note visitor center parking for the 100k and 50k, Lone Rock parking for the half marathon, and permitted vehicle and tent camping in the main parking lot on Friday and Saturday nights. Sacramento International and San Francisco International airports are listed as nearby options. Visit the organization's website for the most recent information.
