Trail Running Calendar California 2026-2027

A two day Spartan obstacle race weekend at Modesto Reservoir Regional Park offering Sprint, Super, Beast and Ultra distances plus a kids race and spectator access.

Multi distance trail running and gravel bike events at Diamond Valley Lake in Hemet, California. Routes include lakeside loops, out and back courses, a stroller 5K and a kids fun run.

A trail running event in Walnut Creek on April 3, 2027 offering 50K, half marathon, 10K, 5K and a remote option. Part of entry fees support Save Mount Diablo and its land conservation work.

A weekend of Spartan obstacle races at Pala Fox Raceway in Pala, CA on Apr 10-11, 2027, featuring a 5 km Sprint with 20 obstacles, a 10 km Super with 25 obstacles, a kids race and spectator options.

Oriflamme 50K on April 10 2027 is an out and back trail race that drops from the Pacific Crest Trail into desert canyons before a long climb back. The event is limited to 150 runners and features stocked aid stations and finisher medals.

Trail races at Noli Indian School on the Soboba Reservation offer marathon, half marathon, 5k and kids 3k options with Native and Open divisions. The event is limited to 100 entrants and includes finisher awards and early T shirts.

A long-running multi-distance event in Agoura Hills with half marathon, 10K, 5K, mile and multi-race challenges, scenic courses through the Santa Monica Mountains, and a post race party.

An overnight lap race in Reedley, California, held around the full moon. Options range from 12K and timed 6, 12, and 24 hour categories to 100 miles, plus 2 to 4 person relays, camping, and full aid station support.

A women's only 10K in Auburn on April 17, 2027 that follows scenic trail loops with aid stations and age-group awards; the overall winner and four additional finishers will be selected to receive all-expenses-paid trips to a women's running..

A trail event at Skyline Ridge Open Space Preserve offering distances from a 50 yard kids dash to a 50K race. Routes run largely on the Bay Area Ridge Trail with ocean and Santa Cruz Mountains views.

A 50K trail race on Northern California’s Mendocino Coast, starting at Big River State Beach and passing river, ocean, redwood and waterfall scenery. Races are listed in April with recent dates including 2025 and 2027.

Leona Divide is a trail running event near Lake Hughes, California, offering distances from 30K to 100 miles. The 100 mile and 100K are Western States qualifiers and the 50 Mile awards AC100 Sterling Silver Tickets.

The Canyons Endurance Runs by UTMB in Auburn, California in April 2027 offer races from 25 km to 100 miles on sections of the Western States Trail. The 100K is a Western States Super Golden Ticket race and the event is a dual qualifier for..

A trail event at Lake Chabot Regional Park offering distances from a 50‑yard kids dash to a 50K ultramarathon. The looped course circles the Lake Chabot reservoir and surrounding hills with measured distances.

No Foolin' Foot Race in San Carlos on April 24, 2027 offers 15K, 10K, 5K and a 1K kids trail course across Big Canyon, Eaton and Pulgas Ridge, with proceeds supporting local open space trail maintenance.

Mud Factor FRESNO is an annual 5K obstacle mud run at Hobb's Grove in Sanger, CA on April 25, 2027, with Adult and KIDZ Family waves; waivers and photo ID are required and spectators pay a $10 cash fee for festival-area access.

A multi-distance trail event near Ojai, California from April 30 to May 2, 2027, featuring races from 10K to 100 miles, large elevation gains, and a cap of 150 total entries.

A 100-mile trail endurance race in the Mount Laguna area using Pacific Crest, Noble Canyon and Lake Cuyamaca trails. The event is a Western States qualifier, is cupless, and requires volunteer hours or a TrailFit donation.

A multi-format trail event in Placerita Canyon offering looped courses, multiple distances and time categories, team relays, camping, cupless aid stations, chip timing, and finisher swag on May 1, 2027 in East Walker Ranch Open Space.

A scenic 5k at Whittier Narrows Park with live mariachi and banda music, water stations, chip timing, and a post-race festival featuring tacos, a beer for 21+, a medal, and a t-shirt.