Alameda County
Trail Running Calendar near Alameda County 2026-2027
Explore the top trail runs near Alameda County for 2026-2027! We've gathered 38 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
August 2026
September 2026
A trail running event at Calero County Park offering distances from a kids run to a 50K across single-track and dirt roads, with named aid stations, drop bag support, bib color assignments, and time limits for longer races.
Trail event in Castro Valley featuring a 100k, 50 mile, and marathon with UTMB index status and firm time limits due to park permits.
Trail running in shaded redwood forest at Sanborn County Park on September 27 2026, with 10K, half marathon and 50K options; steep singletrack, shuttle parking, chip timing and specific mandatory gear for the 50K.
October 2026
A 12.4 mile loop from Mitchell Canyon to the Mount Diablo summit and back with about 4,000 feet of climbing and a five hour cutoff.
Trail races on Mount Diablo near Walnut Creek on October 17, 2026 offering 30K, Half Marathon, 10K and 5K with possible mud and creek crossings.
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 offering a half marathon, 10K, 5K and a free short Little Turkeys run, plus a food drive and a two-day medal challenge.