California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 398 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.
A looped endurance event in Auburn California from September 18 to 21 2026 featuring races from 3 hours to 72 hours on an approximately 0.75 mile loop.
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 running event in Fresno offering a 10K trail, 5K run or walk, a timed 2 mile fun run, and a kids 1/4 mile to support pediatric injury prevention.
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.
Community 10k run/walk in Monrovia on Sep 19, 2026, from Library Park Fountain to Canyon Park waterfall; limited to 350 participants with T shirts and awards.
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.
A social in-person 5k at Carlsbad Forum Lawn where participants prepare and carry homemade ice cream to enjoy afterward, with music, games, free parking, and all ages.
Family friendly 5K on September 20, 2026 in San Francisco with a scenic 3.4 mile course, race t-shirts, post race festivities and age based awards.
Trail 5K at San Pedro Park with a hilly, technical first mile; a kids run and a members only picnic follow.
Multi-distance trail running festival in Mammoth Lakes featuring high‑altitude technical courses, marked aid stations, and sustainability-focused, cup-less race operations.
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.