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Skyline 50k Endurance Run

Castro Valley, United States • 3 Aug 2025

The Skyline 50K Endurance Run is one of California's longest-running 50K races, taking place annually in August at Lake Chabot Marina in Castro Valley. This event is designed for both first-time ultrarunners and seasoned veterans, featuring a scenic course that loops through the East Bay Regional Parks. Participants benefit from excellent aid station support provided by local running groups and a vibrant atmosphere created by enthusiastic volunteers. The race concludes with a celebratory gathering featuring plant-based BBQ and beer. All runners receive a race shirt, special socks, and a finisher's medal, making it a memorable experience for everyone involved. Visit the organization's website for the most recent information.

United States California Castro Valley

Race information

Website Registration
UTMB 20K UTMB 50K
50 km
50k
21 km
21k
Visit the organization's website for the most recent information.
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