Trail Running calendar near Thornton 2026-2027

A point-to-point 100-mile ultramarathon from UC Berkeley to Skyline High School in Oakland, featuring about 18,000 ft of elevation across ridgelines, redwood forest and lake trails; the 2026 race is sold out with a waitlist.

A multi-distance trail event in Cool, California on June 13 and 14, 2026 featuring 13.5 and 11.5 mile loops, live runner tracking, single track and fire road terrain, and finisher awards for every distance.

A 100-mile trail event on two alternating loops in Cool, California, totaling about 13,600 feet of elevation gain. The race features marked single track and fire roads, aid stations, chip timing with live tracking, and handcrafted finisher..

Experience a fixed-time event at Crissy Field with stunning views of the Golden Gate Bridge. Run or walk as many laps as you choose in three six or twelve hour blocks as an individual or part of a team.

A new trail race at Lagoon Valley Park in Vacaville offering 30K, 10K, 5K and a kids 1K fun run. Routes traverse single track, fire roads, oak groves and a lagoon, with marked courses, aid stations and long sleeve tech shirts.

Annual 5K and 10K fun run and walk each June at Hunting Hollow in Henry W. Coe State Park. The relatively flat dirt course runs through a wildflower-lined valley with oak trees and occasional wildlife, with proceeds supporting park projects..

A 5K fun run and walk at Cosumnes River Preserve in Galt, California on June 13, 2026. The in person event follows trails within the preserve, is organized by Cosumnes River Preserve, and has free admission.

Tails & Trails Charitable Walk/Run in Santa Rosa supports Dogwood Animal Rescue with in person and virtual options, flat scenic trails, a community finish area, and a limited edition 2026 dog bandana for participants.

A community event in Auburn CA offering a 100 runner relay with one mile per runner and an open 100 mile multi day challenge, both with a $35 entry and finisher items for participants.

Live and virtual options at Lake Chabot feature 5K, 10K, and a half marathon with multiple aid stations, on-course nutrition, race apparel and a woodallion, post-race beverages, and a brewfest atmosphere.

A 10-mile trail race in Redwood Regional Park with single-track terrain, a timed 0.8 mile hill climb, age-based handicap starts, limited to 250 runners, and a team competition.

A community Independence Day event at Sycamore Grove Park featuring a flat 5K on mixed paved and dirt trails and a 400 meter kids run for ages 10 and under. T shirts are included with race fees.

A map based urban navigation run in San Francisco with 5K and 10K map courses starting at Ghirardelli Square. Teams of one to five use custom maps to find checkpoints, with refreshments and socializing after the finish.

A multi-distance trail event at Rancho Cañada del Oro Open Space Preserve on July 4, 2026, with routes from 5K to 50K over hilly single track and dirt roads. Two fully stocked aid stations support runners and time limits range from 1 to 9 h..

An unconventional half marathon in Auburn that blends running with extreme ironing, requiring participants to iron a button up shirt at multiple public locations while remaining self supported and documenting each stop on video.

Trail races of 10K, half marathon and 30K run from Stinson Beach into Mt Tam and Muir Woods, featuring steep climbs, technical single-track, marked courses, aid stations, and chip timing.

Timed trail races at Point Pinole on July 25, 2026 offer 12 hour, 6 hour and 3 hour formats on a 3.37 mile loop with shoreline views and eucalyptus groves. Solo runners and two or three person teams are accepted, and entry includes an all d..

Trail running at Calero County Park with multiple distances across single track and dirt paths, significant climbs, aid stations and free parking at the park.

A trail race in Auburn, California on July 26, 2026 offering 10.5 mile and 5.9 mile courses on single track, canal, dirt and some paved surfaces. Post race food and beer are provided to finishers aged 21 or older.

A multi-distance trail event at Rodeo Beach in the Marin Headlands offering 50K, 30K, Half Marathon and 8K courses with coastal single track, significant elevation, ocean views, varied aid stations, and chip timing.