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Built on bad decisions in Boulder, CO.

Lake Sonoma

3 Race EventsHalf Marathon, 100K, 50K

Trail Sisters LLC

Geyserville, California, United States

Course map for Lake Sonoma 100K

Lake Sonoma 100K

Apr 10, 2027

100KCrew

Course map for Lake Sonoma 50K

Lake Sonoma 50K

Apr 10, 2027

50KCrew

Course map for Trail Sisters Half Marathon at Lake Sonoma

Trail Sisters Half Marathon at Lake Sonoma

Apr 10, 2027

Half Marathon