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Skyline 50k Endurance Run

Name: Skyline 50k Endurance Run
Start: 2025-08-03
End: 2025-08-03
Location: Castro Valley

Castro Valley, United States • 3 Aug 2025

The Skyline 50K Endurance Run is one of the oldest continuously running 50K races in the United States, taking place annually in August at Lake Chabot Marina in Castro Valley, California. 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, making it enjoyable for all skill levels. Runners receive a race shirt, special socks, and a finisher's medal, with awards for top performers in various age categories. 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.

Trail runs nearby

Saturday Dec 28

Brazen New Year's Eve

The Brazen New Year's Eve event offers participants the chance to run a half marathon, 10K, or 5K at Lake Chabot in Castro Valley, California. This event is designed for runners of all levels, including hikers and walkers, making it a perfect way to close out the year with friends and fitness. Parti..

Wednesday Jan 1

Brazen New Year's Day

The Brazen New Year's Day event offers a scenic and invigorating start to the new year with races at Lake Chabot in Castro Valley. Participants can choose from a half marathon, 10K, or 5K, making it a family-friendly occasion. The event encourages runners to kick off their resolutions and enjoy the ..

Saturday Jan 4

Hacienda Hills Trail Run - Winter

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The Hacienda Hills Trail Run - Winter is an exciting trail running event taking place at Almaden Quicksilver County Park in San Jose, California. Scheduled for January 4, 2025, this event features nine different race distances, including a Kids Run, 5K, 10K, half marathon, marathon, and a challengin..

Sunday Jan 12

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Woodside - 21 mi from Castro Valley

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The Crystal Springs Trail Run, scheduled for January 12, 2025, in Woodside, California, offers a variety of race distances including an 8K, Half Marathon, 35K, Marathon, and 50K, along with a free Kid's Run for children aged 6 and under. Participants will enjoy scenic trails through Huddart Park, fe..

Saturday Jan 25

Coyote Hills Run

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Saturday Feb 1

Mt. Umunhum Trail Conquest - Winter

San Jose - 26 mi from Castro Valley

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The Mt. Umunhum Trail Conquest - Winter is an exciting running event taking place at Almaden Quicksilver County Park in San Jose, CA. Participants can choose from various distances, including a 50K, Marathon, 30K, Half Marathon, 7 Miler, 5K, and a Kids Run.The course features scenic trails that lead..