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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 California's oldest and most celebrated 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. Runners receive a race shirt, special socks, and a finisher's medal, with awards for top performers in various age categories. The event culminates in a festive celebration with plant-based BBQ and beer. 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

Sat - Sun Nov 23-24

Golden Gate Trail Classic

San Francisco - 20 mi from Castro Valley

The Golden Gate Trail Classic will take place in San Francisco from Saturday 23 November 2024 to Sunday 24 November 2024. You can run between 15 and 50 miles.

Thursday Nov 28

Zoom Turkey Trot

San Jose - 26 mi from Castro Valley

The Zoom Turkey Trot is a festive running event taking place in San Jose, California, featuring multiple race options including a 5K, 10K, and Half Marathon, along with youth categories and a free Kid's Run. Scheduled for Thanksgiving morning, participants can enjoy a scenic run along the Coyote Cre..

Saturday Nov 30

Quad Dipsea

Mill Valley - 30 mi from Castro Valley

28 mi

The Quad Dipsea is a challenging 28.4-mile running event held in Mill Valley, California, featuring approximately 9,000 feet of elevation gain. Participants navigate a demanding course that includes steep stairs, rugged trails, and scenic views of the Pacific Ocean. The race begins at Old Mill Park ..

Saturday Nov 30

Quarry Turkey Half Marathon

Fremont - 11 mi from Castro Valley

The Quarry Turkey Half Marathon is a family-friendly running event taking place on November 30, 2024, at Quarry Lakes Regional Park in Fremont, California. Participants can choose from a half marathon, 10K, or 5K, along with a free Little Turkeys race for children. The event encourages Thanksgiving-..

Saturday Dec 7

Zombierunner Quarry Lakes

Fremont - 11 mi from Castro Valley

...

The ZombieRunner Quarry Lakes event, scheduled for December 7, 2024, in Fremont, California, features a variety of running distances including a 5K, 10K, Half Marathon, 30K, and Marathon, along with youth categories and a free Kid's Run. The scenic course begins at Quarry Lakes Regional Recreation A..

Saturday Dec 7

Calero Trail Run - Winter

San Jose - 26 mi from Castro Valley

...

The Calero Trail Run - Winter, held at Calero County Park in San Jose, CA, offers a variety of trail running distances including 50K, Trail Marathon, 25K, Half Marathon, 15K, 10K, 5K, and a Kids Run. Participants can enjoy scenic single tracks, challenging hills, and dirt paths, making it an excelle..