O'Neill Park Trail Races

Totally 80's Fast Times in Huntington Beach, organized by CaliFlow Runs, offers a throwback festival-style race weekend at Bolsa Chica State Beach (Lot 25) in Huntington Beach, CA. The event features three distances—5K, 10K, and Half Marathon—plus a Kids Dash. Runners enjoy a flat, scenic, car-free..

That's No Moon Trail Races, held in Silverado, California, runs through the Cleveland National Forest and the Santa Ana Mountains. Distances include 50 Mile, 50K, and 30K on rough remote terrain—single-track trails and forest roads with significant elevation and exposed ridges. Expect demanding clim..

The Rock It in Chino Hills 5K & 10K is a trail running and hiking event held at Chino Hills State Park in Brea, California. Participants can choose between a 5K or 10K course that showcases the park's stunning and expansive trails, offering scenic views and a tranquil outdoor experience. The race in..

Live Oak Odyssey is a fixed-time trail run held at O’Neill Regional Park in Trabuco Canyon, California. It offers 3- and 6-hour options on a 2.75-mile loop with about 500 feet of vertical gain per lap, challenging runners with a mix of ups and downs, single-track, and double-track sections. The wood..

Casper's Trail Races on Oct 25, 2025, take place in San Juan Capistrano, California, offering trail distances: 10K, 13.2 miles, 30K, marathon, and 50K. The event, hosted by KHraces, aims for a well-supported, well-marked experience with swag, highlighting Orange County’s fall trail atmosphere. While..

The Machete Muertos 200 is an ultramarathon event held at Lake Perris, California, featuring multiple race distances including 10, 20, 50, 100, and 200 miles, plus a 20-mile ruck division. The course consists of challenging loops with significant elevation gains—2,300 feet per lap for shorter distan..