Trail Running calendar near Lake Sonoma 2026-2027

Trail races around San Pablo and Briones Reservoirs on October 10, 2026, with 5K, 10K, half marathon and 35K options. The course features single-track and fire roads, aid stations with varied supplies, and awards for finishers.

Trail races at Lake Sonoma in October offering 100 mile, 50 mile, marathon and four person relays. Courses feature extensive singletrack, multiple aid stations, on-site camping and significant elevation gain.

A trail race in Bothe-Napa Valley State Park on October 24, 2026 offering Marathon, Half Marathon, 10K and 5K. The single-track course features hills, stream crossings and narrow sections, and the field is limited to 300 runners.

Trail races run from Stinson Beach to Mt. Tam on November 7, 2026, with distances from 10K to a 50K that has an 8.5 hour time limit. Awards, finisher medals, aid stations, and post-race food are provided.

A 28.4 mile trail race in Mill Valley with about 9,000 feet of climbing on the Dipsea Trail. The course is an out and back to Stinson Beach that is then repeated to complete the Quad.

A seasonal cross country event in San Francisco on 12/6/2026 with live and virtual options. Distances include a 5K, 10K, and a nine mile course; all entrants receive race swag and there is a pre race bib and shirt pickup with Brewfest.

Peacock Gap Trail Run at China Camp State Park on December 5, 2026 offers 10K, half and 30K trail courses with marked single track and fire roads, chip timing, aid stations, and a cupless water policy.

The Hunter S. Thompson Fear & Loathing will take place in San Francisco on Sunday 6 December 2026. You can run between 50 and 50 miles.

A trail running event that crosses the Golden Gate Bridge into the Marin Headlands. Races include 15K, 25K, 50K and 50 mile options on January 23 to 24, 2027, organized by Spartan Trail.

Experience the coastal beauty of the Marin Headlands at the Golden Gate Trail Run. Choose from distances ranging from a 50K trail race to a fun kids dash with views of the Golden Gate Bridge and San Francisco.

Experience a trail run across the forest and hills of Angel Island with views of San Francisco and the Golden Gate. Choose from multiple race distances including a youth dash and enjoy a picnic at Ayala Cove.

A three day trail running weekend in Marin County offering a point to point 100K plus single loop 50K and 28K that summit Loma Alta and Big Rock Ridge.

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.

A timed half marathon through eight Napa Valley wine estates finishing in Yountville. The event includes a finish line Wine Village with live music and complimentary wine tastings.

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.

Trail runs at Skyline Wilderness Park on May 15, 2027, offering 10K to 50K courses with substantial climbing, spaced aid stations, a cupless policy, and new trails through Napa Open Space.

A Napa Valley trail ultramarathon using Skyline Wilderness Park and Suscol Headwaters trails, offered as a solo ~50-mile challenge and a one-loop ~25-mile option, with cupless aid stations, drop bags, and specific crew and pacer rules.