California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 380 exciting trail runs across the region. Find your next trail run in California below and join the trail community at these great events!
May 2027
Trail race in Placerita Canyon, Santa Clarita on May 1, 2027. Multiple distances from 1 mile to 60K, 6 and 12 hour categories, and team relays. Camping, cupless aid stations, and finisher medals are part of the event.
A 5k through Whittier Narrows Park with tacos, beer for 21+, live mariachi and a post race festival; packet pickup occurs the day before and a 2 hour time limit applies.
Trail running in the Stinson Beach and Muir Woods area with marathon, half marathon and 7 mile options. The event is organized by Enviro Sports and is tentatively scheduled for May 2027.
Trail races in Lone Pine, CA on May 1, 2027 offering 50 mile, 50K, marathon and 10 mile courses through the Alabama Hills near Mt Whitney with ten aid stations.
A self supported marathon in San Diego on May 8, 2027 held in memory of a runner; no official timing or aid stations and participants are on their own.
A 13.1 mile point to point half marathon through Napa Valley vineyards, mostly on private winery roads, finishing in Yountville's Wine Village.
A community trail run and hike on May 8, 2027 at the Point Arena and Stornetta Lands, co-hosted by ACORN and Pacific Community Charter School. Proceeds support the Students Protecting the Coast environmental education program.
A 13.1 mile race around Bass Lake through the Sierra National Forest with mixed fire road, trail and downhill pavement sections, cup free aid stations and shuttle access.
Trail runs of 50K, 25K and 5K at Crystal Cove State Park on May 8, 2027 supporting the John Wayne Cancer Foundation.
A multi-distance trail event in Susanville, CA on May 8, 2027 featuring mostly single-track courses, aid stations with varied supplies, and a cupless race format.
Trailquake in Saratoga on Mother's Day offers 5K, 10K, a half marathon and a hiker division on redwood and pine forest trails. Finishers receive custom medals and shirt options.
Weeklong trail ultra in Los Olivos CA with 100 mile and shorter loop races, onsite camping, aid stations and chip lap counting.
A Spartan obstacle-course weekend at Big Bear Mountain Resort with Sprint, Super, Beast and kids races at about 8,200 feet and the chance to earn a Trifecta.
Trail races at Skyline Wilderness Park near Napa on May 15, 2027 offering 10K, 21K, 30K and 50K courses with new trails, aid stations, and a cupless policy.
Trail races at O'Neill Regional Park with multiple distances through Trabuco and Live Oak Canyons and a $5 parking fee.
A multi loop trail ultra in Napa’s Skyline Wilderness Park covering about 50 miles through oak forests, exposed ridgelines and the Suscol Headwaters trail system.
A race day in El Sobrante with a half marathon, 10K, 5K and a hiker division through the hills of Wilcat Canyon; registration windows and fees vary by distance.
A scenic trail event at Big Bear Mountain Resort featuring singletrack through high altitude pine forest and a 10K route with spectator options.
Mud Factor's Seriously Fun 5K mud and obstacle run returns to Mahon Ranch in Elk Grove on May 16, 2027, with adult and KIDZ family waves and required waivers for participants.
Charity trail event at Skyline Ridge Open Space Preserve offering 50K, 30K and 10K with all registration proceeds donated to UCSF cancer research.