Alameda County
Trail Running Calendar near Alameda County 2026-2027
Explore the top trail runs near Alameda County for 2026-2027! We've gathered 37 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
September 2026
Historic Bay Area trail event offering 100K, 50 mile and marathon courses, all UTMB indexed with the 50 mile in the Pacific USATF Grand Prix.
Trail races at Sanborn County Park on Sep 27, 2026 through shaded redwood forest with steep climbs and flowy singletrack.
October 2026
21st Annual Garin Park XC Challenge at Garin Regional Park is a USATF Pacific Association cross country meet with about 5K courses featuring hills, scenic views, and a half mile flat finish.
Experience a 12.4 mile loop to the summit of Mount Diablo featuring 4,000 feet of elevation gain and a steep descent through scenic California trails.
A trail race at Almaden Quicksilver County Park with distances from 5K to 50K. Courses are out-and-back, marked with colored ribbons, include aid stations and toilets, and the longer races reach Bald Mountain and Mt. Umunhum.
Trail races on Mount Diablo in Walnut Creek on October 17, 2026 offering 30K, half marathon, 10K and 5K on hilly trails with possible mud and creek crossings.
Trail races at Almaden Quicksilver County Park offering a half marathon, 10K and kids 1 mile with historic mining views and local conservation support.
November 2026
Experience a scenic trail run around the Lake Chabot reservoir and hills. With distances from a 50 yard kids dash to a 50K ultramarathon there is an option for everyone at this Castro Valley event.
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 Thanksgiving weekend race at Quarry Lakes Regional Recreation Area offering a mostly flat half marathon, 10K, 5K and a short kids run plus a food drive.
December 2026
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 races at Almaden Quicksilver Park on January 2, 2027 offering distances from a kids run to a 50K with marked dirt road courses and multiple aid stations.
Scenic races at Coyote Hills Regional Park offering half marathon, 10K and 5K on varied surfaces with rolling bay views and stocked aid stations.