Trail Running calendar near Irvine 2026-2027

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 historic point to point 100-mile ultramarathon through the San Gabriel Mountains, the 36th Angeles Crest AC100 tests endurance with over 21,000 feet of climbing and a 2026 course routed to finish at Loma Alta Park in Altadena.

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 at Ernie Howlett Park on the Palos Verdes Peninsula with a shaded horse-trail course, in-person and virtual options, and a fundraising entry where raising $100 covers registration and benefits Strides in Recovery.

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

A Halloween themed running event in Valencia offering 5k, 10k, 15k and a half marathon on a marked out and back trail. Each loop has an aid station and registration includes a finisher medal, photos, and posted results.

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.

On October 10, 2026 That's No Moon offers 50 Mile, 50K and 30K races in the remote Santa Ana Mountains near Silverado. Courses run on forest roads with significant elevation gain, staffed aid stations, and mandatory self-sufficiency require..

Trail races of 10 mile, 10K and 5K run through Gonzales Canyon Open Space in Carmel Valley on October 10, 2026. The courses include the steep section known as Puke Hill and entries are limited to 300 runners.

Ruff Run California on 10/17/2026 in Phelan, CA presents a 20 acre obstacle course for people and their dogs with over 20 obstacles, 4K and 1K options, and an after party with music, games and vendors.

A multi-distance running event on the Cahuilla Indian Reservation near Anza, CA, featuring a runnable 2 mile loop, fixed-time races and a 100 mile option with a buckle; proceeds support the tribe's Youth and Family programs.

Experience a diverse weekend of trail running and off road duathlon at San Diego’s Scenic Lake Hodges. Choose from distances ranging from a kid’s mile to a 50K ultra marathon or tackle the mountain bike and run challenge.

A trail race at Vasquez Rocks in Agua Dulce on October 17, 2026 offering Half Marathon+, 15K, 10K and 5K loops through rock formations, canyons and a 500 foot tunnel on the Pacific Crest Trail with multiple aid stations.

A trail running event in October at Hahamongna Watershed Park offering 5K, 10K and a hilly half marathon across mixed single track and fire roads.

A 200-mile multi-day endurance run around San Diego County from October 23–26 with an 82-hour cutoff, mandatory crew support, a 24-runner field limit, and entry fees that include a charity donation.

An individual trail event at Los Coyotes Reservation on October 23-24, 2026 offering a 3.1 mile Yellow Loop plus 6 hour and 24 hour ultra formats on the relay loops, with camping, food trucks, bonfires, and festival amenities.

A team trail relay at Los Coyotes Reservation on October 23 and 24, 2026 featuring desert and mountain single track, a 112.8 mile course shared across teams, and on site camping plus glamping at Ragnar Village.

A trail event at Wildwood Canyon State Park featuring a timed 8 hour loop format and a single-loop 6K, with aid stations, vendors, morning live music, and an afterparty at a local brewery.

No Name Trail Races in Agoura, CA on October 24, 2026 feature trail courses through Chesebro Canyon, including a 50K, a 14.1-mile half-marathon, and a 3.6-mile 5k, with aid stations, finisher medals and post-race refreshments.