California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 395 exciting trail runs across the region. Find your next trail run in California below and join the trail community at these great events!
September 2026
Test your endurance at Smith Ranch in a 4.18 mile loop race where participants run every hour until only one runner remains standing.
Mile Madness is a looped trail endurance event in Auburn, California, held September 18-21, 2026. Timed events run from 3 to 72 hours with a 0.75 mile loop and options including a 100 mile race plus on-site aid and amenities.
Trail runs at Granite Beach, Folsom Lake SRA on September 19, 2026 featuring new 10 mile and 5K courses along shoreline and single track trails.
Experience trail running on a private cattle ranch in Bradley with loop courses ranging from 12km to 48 hours featuring live music and on site camping.
A community run at George's River Ranch along the San Joaquin River on September 19 2026. Events include a 10K trail, 5K, 2 mile and a kids quarter mile with registrations opening June 1 2026.
A sunset 10k in Topanga Canyon through Red Rock Canyon featuring steep climbs, singletrack, a descent to the finish, and a post-run gathering under the oaks.
Trail-based half marathon plus 5K and 10K with hills and scenic views in San Ramon on September 19, 2026; virtual entries available.
A riverside event in Fresno with 10K, 5K, 2 mile and kids quarter mile options supporting Valley Children's Pediatric Trauma Injury Prevention Program.
A timed 5K Adventure Challenge with obstacles and a Kid Family Fun Run at Westside Pavilion, Tuolumne, with headbands for all and a 5K finisher medal.
The Rebels XC Challenge is a cross-country event in Carmichael, California, featuring dedicated races for Women, Masters Men, and Open Men.
A community run and walk in Monrovia on September 19, 2026, limited to 350 participants with pre registration and day of registration options.
A cross country 5K at Rancho Bernardo Community Park with a grass start, dirt trail loop, age group awards, on site prizes and proceeds benefiting El Camino High School water polo.
Family friendly Jog in the Fog 5K in San Francisco with a scenic 3.4 mile course, post race activities, age group awards, and a race t shirt for registrants.
Trail 5K at San Pedro Park with a hilly, technical first mile; a kids run and a members only picnic follow.
Multi-race trail weekend in Mammoth Lakes featuring marked mountain courses, aid stations, chip timing, prize money, and sustainability measures.
At U.S. Bank Tower participants climb 75 floors or take a self-guided urban hike to support Ketchum Downtown YMCA programs, then gather for a block party with music and food.
Obstacle course weekend at Lake Elsinore Raceway featuring Sprint 5K, Super 10K, kids races, and Hurricane Heat formats on September 26 to 27, 2026.
A chip timed 5K trail run and walk at Ascot Hills Park with city views, finisher shirt and medal, live results and community activities.
Historic Bay Area trail event offering 100K, 50 mile and marathon courses, all UTMB indexed with the 50 mile in the Pacific USATF Grand Prix.
Trail ultras from the Mt. Wilson summit offering 25K and 50K routes on technical single track with stocked aid stations and awards for top finishers.