Prepare to challenge yourself at the historic Skyline 50k Endurance Run, taking place on August 2, 2026, in scenic Castro Valley, California. This event, boasting a legacy as one of the oldest continuously running 50k races in the United States, offers both a demanding 50K ultramarathon and a challenging 21K (half marathon) distance, welcoming both seasoned ultrarunners and those looking to tackle their first long-distance trail race. Runners will navigate a spectacular loop course that starts and finishes at Lake Chabot Marina, winding through the diverse East Bay Regional Parks. Typical race day conditions in early August bring pleasant highs around 75F and lows around 58F, with historically no chance of precipitation.

The 50K course is a true test of endurance, featuring approximately 4,642 to over 5,000 feet of elevation gain across a mix of wide fire roads and technical single-track trails that comprise about 90% of the route. Runners will be treated to breathtaking panoramic views of Lake Chabot and the surrounding valleys in the opening and closing miles, transitioning into lush, shaded sections through the majestic redwood and eucalyptus groves of Reinhardt Redwood Regional Park during the middle portions of the race. While offering significant climbs and descents, much of the course remains runnable, though runners should be prepared for some rocky and rooted sections.

A standout feature of the Skyline 50k is its exceptional support system, with "phenomenal" and "incredible" aid stations staffed by enthusiastic Bay Area running groups. These eight well-stocked stations (the first being water-only) provide everything from gels, chips, candy, and fresh fruit, including highly praised watermelon, to essential hydration like water, sports drinks, and soda. Expect proactive volunteers and a Volunteer Safety Patrol at key intersections, ensuring clear direction and a lively atmosphere throughout your journey. Upon crossing the finish line at Lake Chabot Marina, celebrate your accomplishment with a finisher medal, race shirt, special Skyline socks, and a much-anticipated plant-based post-race BBQ, often accompanied by beer, solidifying the race's reputation for its strong community vibe and runner-focused experience.