Trail Running Calendar California 2025-2026

Take on the San Diego 100, a rugged 100 mile loop at Lake Cuyamaca near Julian across mostly single track, technical trails and big climbs. A Western States qualifier that rewards experienced ultrarunners with epic desert and mountain scene..

Remembering Dingneng is a memorial, non competitive marathon along San Diego's scenic Los Penasquitos Canyon Trail. Self supported and flexible, runners choose their distance and can register free for an official result.

Run the iconic Wild Wild West Marathon & Ultra through the dramatic Alabama Hills and Mt Whitney foothills in Lone Pine, CA. Choose from 10 mile, marathon, 50K or 50 mile options on classic, well supported trail terrain.

Tackle the iconic Miwok 100K through the Marin Headlands on May 2, 2026, where redwoods, ridgelines, and coastal views await. Limited to 400 runners, this supported trail ultramarathon blends rugged challenge with community and sustainabili..

Join Tails & Trails on May 3, 2026 in Windsor CA to support Dogwood Animal Rescue with a fun 5K, Dogwood Dash, or virtual option. Bring your pup for a dog friendly run and help animals in need.

Run or walk the Waves & Whales 5K on the Mendocino Coast in Point Arena, following bluffside trails through pine and cypress forest. Proceeds benefit student coastal stewardship and entrants get an organic cotton tee and handmade medallions..

Run scenic single track and dirt roads around Lake Anza in Tilden Regional Park, Berkeley, with distances from a family friendly kids dash to a tough 50K. Pre registered runners get shirts, all finishers earn custom medals and aid stations..

Join the 30th Paiute Meadows Trail Run in Susanville, California on scenic single track through pine forests, meadows, climbs and water crossings. Distances from 1 mile kids to 50K and community staffed aid stations welcome runners of all l..

Run from Stinson Beach into the ancient redwoods of Muir Woods on a scenic, rugged course with ladders, staircases, streams and summit views. Choose marathon, half marathon or 7 mile on May 9, 2026; field limited to 300 runners.

Trailquake 2026 in Saratoga on May 10 delivers scenic, climbing single track trails with half marathon, 10K and 5K options for runners and walkers of all abilities. Presented by Brazen Racing with shirts and awards for finishers.

The Bishop High Sierra Ultras, held at Millpond Recreation Area in Bishop, California, offers challenging high-altitude trail races including 6K, 20 Mile, 53K, 50 Mile, and 100K distances. The courses traverse scenic Eastern Sierra Nevada f..

Run scenic paved trails in Roseville on May 16, 2026 at the Wild Rose Half Marathon or join the fun 5K run or walk, finishing at Moksa Barrel House. All finishers get a medal and drink ticket and runners choose a tech shirt or BOCO hat.

Wildcat 2026 on May 16 in El Sobrante offers scenic 360 degree views of the Bay Area with race choices from 5K to half marathon or a remote option. Join the fun and help support the East Bay Regional Parks Campership Program.

Tierra Redonda Mountain Trail Run and Camp brings runners to scenic Bradley, CA for trails, camaraderie, and camping. Choose from options from 5 km to 48 hour and enjoy singletrack and community vibes.

Run scenic trails at O'Neill Regional Park on May 16, 2026, with distances from 10k to 50k for every level. Expect challenging singletrack, on site bib pickup, and a friendly race day vibe that welcomes beginners and ultrarunners.

Explore Napa's Skyline Wilderness Park on May 16 with 50K, 30K, half marathon and 10K trail runs through rim rock climbs and panoramic views of Mount Diablo, Mount Tam and Mount Saint Helena. Aid stations and on course support keep you movi..

Rimrock 50 Mile Trail Challenge in Napa invites solo runners and two person relay teams to tackle two scenic loops through Skyline Wilderness Park and nearby preserves. Expect staffed aid stations, on site camping, and hearty post race food..

Celebrate the 15th anniversary of Run for Amma, a charity trail run at Skyline Ridge supporting UCSF cancer research. Choose from challenging 50K and 30K routes or a scenic 10K, and enjoy community support from volunteers and local clubs.

Run the 10K Spartan Trail at Big Bear Lake on singletrack through high altitude pine forest with technical climbs, descents and sweeping Sierra views. A scenic, challenging mountain course that joins a Spartan Trail weekend of adventure.

Western States Training Camp - Memorial Weekend (May 23-25, 2026) The event takes place in Foresthill, CA (24750 Foresthill Rd) over Memorial Day weekend. It offers three training runs that cover the final 70 miles of the Western States cou..