Embark on an unforgettable trail adventure at the O'Neill Park Trail Races, set for May 16, 2026, in the stunning Trabuco Canyon, California. Offering a range of distances including 50K, Marathon, 30K, Half Marathon, and 10K, this event caters to every level of trail runner eager to experience the natural beauty of Orange County. The course, celebrated as a "gem of South Orange County," winds through 4,500 acres of O'Neill Regional Park, where runners will traverse diverse terrain featuring challenging uphills, exhilarating downhills, and a mix of single and double track trails. Prepare to be immersed in picturesque scenery, running among iconic coast live oak and sycamore trees, and passing hillsides dotted with cactus, wild buckwheat, sagebrush, and scrub oak.

Runners consistently praise the "spectacularly beautiful" and challenging nature of these trails, making for a truly engaging race experience. Typical race day conditions in mid-May present comfortable weather for trail running, with highs around 78F and lows around 56F, accompanied by a minimal 2% chance of precipitation. Along your journey, you'll find well-stocked aid stations to keep you fueled, though runners are encouraged to bring their own reusable cups or hydration systems as the event is cup-less, emphasizing environmental responsibility. The start and finish lines are conveniently located within O'Neill Regional Park, with optional bib pickup available the day prior or on race morning.

Whether you're pushing for a new personal best in the 50K, which features over 3,000 feet of elevation gain, or enjoying a scenic 10K, the O'Neill Park Trail Races, organized by the highly-regarded KHRaces, promises a professionally managed event with an exceptional atmosphere. Prepare for a day of breathtaking views, challenging ascents, and memorable descents through one of Southern California's cherished natural landscapes.