California Fall Classic at Lake Sonoma
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Event overview
The California Fall Classic at Lake Sonoma is a trail ultramarathon held at Lake Sonoma near Healdsburg, California on October 18, 2025. The event offers two distances:
- 100K
- 55K
The 100K is a Western States Endurance Run qualifier. Both courses include many miles of single-track trail with views of Lake Sonoma and take place during wine country harvest season. The 100K course has five full aid stations and three water stations, with no more than seven miles between aid points. The 55K has five full aid stations and two water stations. Cutoffs are enforced at several aid stations on the 100K course, including Lone Rock, Little Rock, Madrone Crosscut, and Warm Springs.
Logistics and policies
Packet pickup is available at Healdsburg Running Company and at the start area. The main race parking is the overflow lot near the Lake Sonoma Visitor Center; there are no gas stations near the course. Weekend amenities include on-site camping, live music, and local food, wine and beer. Proceeds support the Children of Vineyard Workers Scholarship Fund.
Event rules and policies include no littering, no pacers, and no trekking poles. The race has a zero-tolerance anti-doping policy and may conduct drug testing; refusal to submit to testing can result in disqualification and a lifetime ban. Pregnancy deferrals are permitted to the next two years. Race cancellations will result in automatic re-registration to a rescheduled date with no refunds. Visit the organization's website for the most recent information.