Brea
Trail Running Calendar near Brea 2026-2027
Explore the top trail runs near Brea for 2026-2027! We've gathered 53 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
October 2026
Free social trail run on October 17, 2026 in Newport Coast with an approximately 6.5 mile hilly route plus post-run snacks and a raffle.
An in-person and virtual 5K on October 25, 2026 in Los Angeles raising funds for dyslexia education with a flat dirt-loop course and on-site amenities.
A 3.6 mile trail loop at Coastal Peak Park with about 585 ft gain per loop through coastal sage scrub and riparian canyons; part of the Southern California UltraRunner Grand Prix Series.
November 2026
Two mornings at Runyon Canyon Park with free registration and 5K and 10K route options on November 6 and 7, 2026.
Trail race in Silverado CA rerouted to Black Star Canyon on Nov 7, 2026, with a new 25k and multiple aid stations.
Nighttime trail races of 5K and 10K at Marvin Braude Mulholland Gateway Park on a lighted course with elevation, aid stations, and a cupless format.
A Griffith Park 5K run and walk hosted by the Sandy Rollman Ovarian Cancer Foundation to raise funds and awareness for ovarian cancer research.
A 4K pet division and a 5K human-only race in Griffith Park on 11/14/2026, with proceeds supporting the Run for Paws nonprofit.
Fixed-time trail runs of 3, 6 and 8 hours on an approximately 2.75 mile loop at O'Neill Regional Park with wooded single and double track and a main aid station.
Trailsgiving offers trail races in Elysian Park with 5k, 10k, 15k and half marathon options, marked out-and-back loops and an aid station at the turnaround.
Multiple distances at Whittier Narrows on November 15, 2026 with marked out-and-back loops, aid station, finisher medals, photos, and race-day registration options.
A mud-and-obstacle 5K at Oak Canyon Park on November 21, 2026, featuring mud pits, walls, monkey bars, a finish-line festival, and packet pickup the day before.
Trail running event in Griffith Park on November 21, 2026 offering distances from 10K to 50K on singletrack and fire road.
Thanksgiving morning trail races in the Santa Monica Mountains near Reseda, featuring a half marathon, 10k and 5k with on-course aid, awards and festival amenities.
December 2026
15K, 6K and Kids 1K trail races at Crystal Cove State Park near Laguna Beach with marked courses, aid stations, a 15K prize purse and post race amenities.
Holiday themed Reindeer Run at Griffith Park on December 19 offering 5 km, 10 km, 15 km and a half marathon on a shared dirt trail with aid station and medals.