California Fall Classic at Lake Sonoma

The California Fall Classic at Lake Sonoma offers two ultramarathon distances: 100K and 55K, run at Lake Sonoma near Healdsburg, California. The weekend features on-site camping, live music, and local food, wine, and beer, with proceeds supporting the Children of Vineyard Workers Scholarship Fund. Runners traverse rugged single-track trails with stunning views of the lake during harvest season.

The 100K is a Western States Endurance Run qualifier for 2026, with generous aid stations and course cutoffs designed to support an 18-hour finish. The event is part of the Lake Sonoma Race Series, held in October 2025, celebrated for wine-country hospitality. Visit the organization's website for the most recent information.