Castro Valley
Trail Running Calendar near Castro Valley 2026-2027
Explore the top trail runs near Castro Valley for 2026-2027! We've gathered 75 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
November 2026
11th annual 5K trail run at Arbolado Park in Walnut Creek with free registration, Mongolian food, kids activities and community-focused programming.
Thanksgiving Day 5K and canicross fundraiser at San Leandro Marina with races for adults and kids, vegan refreshments, and animal welfare fundraising.
A 28 mile out and back on the Dipsea Trail around Mill Valley featuring 9200 feet of climb, single track, many stairs, and aid stations stocked with GU Roctane.
Quarry Turkey in Fremont offers a half marathon, 10K, 5K and a virtual race over Thanksgiving weekend, plus a Little Turkeys kids race and a food drive.
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.
An urban 50K and 50 mile fat ass run from Twin Peaks in San Francisco, with volunteer aid stations and a four hour forty five minute cutoff at mile 25.
A memorial 5K on Baker Beach honoring a longtime DSE member, featuring a mixed surface course with a wooden bridge and parking at the upper lot.
Youth focused event in Oakland with a 1 mile kids fun run and a 5K trail run at Joaquin Miller Park, with limited parking and packet pickup before the race.
Trail races through Sanborn County Park redwoods on December 12, 2026 offering 5K, 10K and half marathon options with chip timing and finisher medals.
New Year's Eve at Lake Chabot in Castro Valley offers trail races on December 31, 2026, with a half marathon, 10K and 5K; walkers and hikers are welcome and free photos are provided.
January 2027
Multi-distance trail races at Lake Chabot across New Year's Eve and New Year's Day, including 5K, 10K, a half marathon and a virtual option.
Trail running weekend in San Francisco that crosses the Golden Gate Bridge and runs through the Marin Headlands, with multiple race distances and spectator access.