Trail Running calendar near Thornton 2026-2027

A 100 mile trail race in Cool, California on June 13, 2026, run on repeated 13.5 mile and 11.5 mile loops over single track and fire roads with about 13,600 feet of elevation gain. Finishers receive a handcrafted buckle and live tracking is..

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.

Trail races of 30K, 10K, 5K and a Kids 1K take place at Lagoon Valley Park in Vacaville. Courses are marked and supported with aid stations offering drinks and snacks.

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..

The Trek the Trails at the Cosumnes River Preserve 5K will take place in Thornton on Saturday 13 June 2026. You can run 5 kilometers.

A community charity walk and run at Howarth Memorial Park supporting Dogwood Animal Rescue Project, with a 1.5 mile course and a virtual option that ships a race packet including a limited-edition dog bandana.

A two-part Auburn event: a 100 person relay with each runner covering one mile on a mostly uphill trail, and a public 20 day challenge to complete 100 miles at any pace. Relay spots require a sub 10 minute mile; challengers earn a finisher..

Experience the scenic trails of Lake Chabot Regional Park with a variety of distances including a 5k, 10k, and half marathon. Enjoy a lively atmosphere with a post-race brewfest and handcrafted finisher awards.

A 10 mile trail race in Oakland that starts at Chabot Space and Sciences Center, featuring hilly single track and the Woodmonster climb. The event uses reverse handicap starts by age, includes a team competition, and a hill climb prize.

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 team navigation run in San Francisco starting at Ghirardelli Square where teams of one to five use a custom map to find checkpoints, with refreshments and social time after the finish.

Multiple trail distances from 5K to 50K on very hilly single track and dirt roads at Rancho Cañada del Oro. The course features scenic foothill views, two aid stations, enforced cutoffs, and finishers receive a medal.

Iron X is an extreme ironing half marathon in Auburn, CA where participants run the course and stop to iron a button up shirt at eight specified locations while carrying their own ironing gear and recording video proof.

Trail races of 10K, half marathon, and 30K run on technical dirt trails at Mt. Tamalpais near Stinson Beach, featuring steep climbs, ocean ridge views, marked aid stations, chip timing, and a cupless event policy.

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.

Trail run in Auburn California on July 26, 2026 featuring 10.5 miles and 5.9 miles courses through single-track, dirt roads and a canal system with steep sections named Cardiac and Last Gasp.

Coastal trail races in the Marin Headlands on August 1 offer 8K, half, 30K and 50K options across non-technical dirt trails with steep climbs, chip timing, cupless aid stations, and scenic views of the Pacific and the Golden Gate area.

A loop trail race from Lake Chabot Marina through East Bay Regional Parks with substantial climbing, offered as a 50K and 21K on August 2, 2026. Finishers receive a shirt, socks, and a medal.

A time-based trail event at Skyline Wilderness Park offering 12 hour, 6 hour and 3 hour options on a 4.16 mile loop with 815 feet of climb per lap; chip-timed, cupless, and limited to 500 entrants.