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Lake Sonoma 100K / 55K

Lake Sonoma, United States • 18 Oct 2025

The California Fall Classic at Lake Sonoma offers challenging 100K and 55K ultramarathon races set in the scenic wine country of Lake Sonoma, California. Known for its relentless courses featuring miles of single-track trails with stunning lake views, the event takes place in the fall, providing cooler weather ideal for endurance running. The race is a Western States 100 Mile Endurance Run qualifier, attracting competitive ultrarunners. Beyond the race, the weekend features a vibrant atmosphere with free camping, live music, and local food, wine, and beer. Proceeds support the Children of Vineyard Workers Scholarship Fund, making it a community-focused event. Visit the organization's website for the most recent information.

United States California Lake Sonoma

Race information

Website
100 km
100k
55 km
55k
Visit the organization's website for the most recent information.
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