Lake Sonoma 100K / 55K

The Lake Sonoma 100K and 55K are challenging ultramarathon races held in California's wine country, offering scenic courses through rugged terrain and picturesque views of Lake Sonoma. Scheduled for October 18, 2025, the events feature two distances that navigate miles of single-track trails, making them ideal for runners seeking a late-season challenge or a Western States 100 Mile Endurance Run qualifier. The races promote community spirit with on-site camping, live music, local food, and wine.

Proceeds support the Children of Vineyard Workers Scholarship Fund, emphasizing both athletic achievement and community support. The event attracts elite and amateur runners alike, celebrating endurance and the beauty of Northern California's landscape. Visit the organization's website for the most recent information.