Castro Valley
Trail Running Calendar near Castro Valley 2026-2027
Explore the top trail runs near Castro Valley for 2026-2027! We've gathered 79 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
November 2026
A Thanksgiving Day 5K and 1 mile event at San Leandro Marina with canicross teams, kids races, and proceeds benefiting animal welfare; the course is flat with mixed surfaces and free parking is available.
A 28.4 mile Mill Valley trail race with about 9,000 feet of climbing, steep stairs and named trail sections on the Dipsea Trail, out and back then repeated to complete the distance.
A Thanksgiving weekend race at Quarry Lakes offering a half marathon, 10K, 5K and a free short Little Turkeys run, plus a food drive and a two-day medal challenge.
December 2026
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.
Single-loop urban ultramarathon in San Francisco from Twin Peaks offering 50 mile and 50K options, informal aid stations, and a mile 25 cutoff.
Trail races through redwood groves in Sanborn Regional Park on December 12, 2026 with 5K, 10K and half marathon options, chip timing and finisher medals.
A scenic half marathon and 10K circumnavigating Angel Island, with mandatory ferry access, a 400 participant limit, and panoramic views of San Francisco.
Trail races on the Lake Chabot trails in Castro Valley on December 31, 2026 offering half marathon, 10K and 5K; hikers and walkers welcome.
January 2027
Lake Chabot trails in Castro Valley host Brazen New Year's Day on January 1, 2027 with half marathon, 10K, 5K plus remote and hiker options.
A trail race in Huddart Park near Woodside CA on January 17, 2027 offering distances from an 8K to a 50K plus a free kids 50 yard dash. Courses run through redwoods, are well marked, and feature stocked aid stations.
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.
Mixed-surface races at Coyote Hills Regional Park in Fremont offering half marathon, 10K and 5K with aid stations, GPX files and a half-marathon hiker division.
February 2027