Runners start · local time — 50K 07:00 · Half 08:30

The Skyline 50K Endurance Run began in 1982 and is considered one of the longest-running 50-kilometer ultramarathons in the United States.

It is known as California’s longest-running 50K race and has been held continuously for more than 40 years—a history that remains one of the event’s greatest assets.

The start and finish are at Lake Chabot Marina in Castro Valley,

and course follows a large loop through the East Bay Regional Parks area, climbing to Skyline Gate before descending.

The race is part of the USATF Grand Prix Series and is an officially recognized event that awards UTMB Index points,

giving it strong credibility for race results.

But Skyline’s real appeal lies in its close ties to the local running community.

Several Bay Area running clubs, including Dusty Bottoms, Running for a Better Oakland, Lake Merritt Joggers and Striders,

and Pamakids, help support the aid station each year, and this volunteer tradition has sustained the event’s atmosphere for decades.

The 2026 race will be held in honor of longtime former race director Ken Gregorich.

With beautiful trails, challenging climbs, and a finish that leaves you feeling like you truly accomplished something,

this event is also considered an approachable introductory course for runners taking on their first ultramarathon.