Trail Running calendar near Brea 2026-2027

Dirt Circus Los Angeles is a one day community running festival on August 29, 2026 that pairs a four mile group trail run with an expo of brands, race directors, vendors, food, and a raffle.

A community running event in Norwalk on September 5, 2026, held as the Higashi Roman Memorial Run and reflecting Cerritos's Dairy Valley history. Organized by Cerritos High School alumni, it offers in-person and virtual 3 mile options.

The 61st Mt Baldy Run to the Top on September 7, 2026 is a fundraising mountain trail race in the Angeles National Forest covering about 7 miles with 4,000 feet of ascent to the 10,064 foot summit, with proceeds aiding local services.

Tough Mudder Big Bear on September 12, 2026 is an obstacle mud run at Bear Mountain near Big Bear Lake, California. It offers 10K and 5K courses, spectator and group options, named obstacles, finisher items and a Mudder Village pass.

A Stadion 5 km obstacle race with 20 obstacles at Angel Stadium of Anaheim on Sep 12, 2026, plus kids races and spectator tickets; the event lists an average finish time near 1 hour 32 minutes and a 4.8 rating from 40 testimonials.

An evening trail event in Griffith Park with a ten mile team relay, a 5K race, and a kid run, featuring scenic sunset views, live music, race photos, and awards for teams and individual winners.

A Topanga trail event featuring a rugged 10k with about 1,360 ft of climb and a non-timed 4.5 mile Hiker's Delight. The courses run mostly on fireroads with a section of singletrack and include aid stations, food, and post-race amenities.

An urban event in downtown Los Angeles with a stair climb up 1,664 steps at the U.S. Bank Tower, an Urban Hike past major cultural sites, a Heroes Challenge category, and a virtual participation option.

A weekend of Spartan obstacle races at Lake Elsinore Raceway on Sep 26 and 27, 2026, featuring Sprint and Super distances, kids races, and timed Hurricane Heat formats. The course uses rugged trails and open terrain near a large natural fre..

A 3.1 mile trail event at Ascot Hills Park in Los Angeles with chip timing and views of Dodger Stadium and the Hollywood sign. Proceeds support the Wilson High School Fire and Police Magnet Cadet Program and Ascot Hills Park.

A trail ultramarathon at Mt. Wilson in the Angeles National Forest offering 25K and 50K courses on technical single track. Courses feature significant elevation gain, marked trails and fully stocked aid stations.

Trail races of 50K, 30K and 15K run through Rocky Peak, Las Lljas and Tapo Canyon in Simi Valley. Courses feature sandstone outcroppings, oak savannah and coastal views with aid stations on the 50K route.

A community running event in San Marcos on September 26, 2026 offering a 10K competitive race, a 5K fun run and a free kids trot, with race shirts, wooden medals and an on-site expo.

A themed run in Long Beach on September 27 with Half Marathon, 10K, 5K, a family mile and kids dash, ocean views, chip timing and a pizza themed finish line festival.

A 100 mile trail endurance run through the San Gabriel back country, scheduled for October 3, 2026 with a full course change and start and finish in Altadena. The race serves as a Western States and UTMB Index qualifier.

A 9.1 mile loop from the Mt Baldy ski area to the 10,064 ft summit of Mt San Antonio via exposed ridgeline and technical alpine trails, then back to the parking lot. The race is capped at 500 runners.

A 5K on shaded eucalyptus horse trails at Ernie Howlett Park in Palos Verdes Peninsula on October 4, 2026. In person and virtual options are available, plus a fundraising route that waives the fee with at least $100 raised for Strides in Re..

The ABWR Half Marathon - Valencia will take place in Santa Clarita on Sunday 4 October 2026. You can run between 5 and 13 miles.

Haunted Heroes in Valencia on October 4, 2026 offers 5k, 10k, 15k and a half marathon on looped trails with aid stations each loop; registration includes a finisher medal and free photos.

A two-day mountain trail festival in Big Bear Lake with five race distances, varied alpine and desert terrain, UTMB World Series Major status, and opportunities for qualification to major trail events.