California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 380 exciting trail runs across the region. Find your next trail run in California below and join the trail community at these great events!
December 2026
Trail races of 50K, 30K and 10K in Ridgecrest, CA at Cerro Coso Community College organized by the Over The Hill Track Club.
Trail races of 30K, half marathon and 10K at China Camp State Park near San Rafael, with chip timing, cupless aid stations, and bay and Mt. Tam views.
A volunteer run fun run and walk on Del Mar beach on December 5th 2026 offering 3K and 5K routes and raising funds for Semper Fi & America’s Fund and San Dieguito River Park.
Single-loop urban ultramarathon in San Francisco from Twin Peaks offering 50 mile and 50K options, informal aid stations, and a mile 25 cutoff.
Holiday-themed Jingle Bell races in Valencia on December 6 offering 5k, 10k, 15k and a half marathon on marked looped trails with aid stations and finisher medals.
Trail 5K and 10K at Elfin Forest Recreational Reserve with chip timing, a 1K kids run, a 10K team competition, and proceeds shared with local conservancy.
A Last Person Standing race in Yucaipa, CA on Dec 11, 2026 with hourly 4.167-mile loops on rugged foothill terrain; limited camping and a published entry fee.
Trail races at Crystal Cove State Park on December 12, 2026, featuring a prize-backed 15K, a 6K and a Kids 1K with shirts, medals, aid stations and post-race amenities.
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.
Trail races at Daley Ranch near Escondido with 10 Mile, 10K and 5K courses on single track and dirt roads; the 10 Mile reaches Stanley Peak for a 360 degree view and the event limits entries to 300 runners.
Trail races in Pilot Hill, CA on Dec 12, 2026 offering distances from 5K to 50K on stony, hilly dirt paths with lake views.
A scenic half marathon and 10K circumnavigating Angel Island, with mandatory ferry access, a 400 participant limit, and panoramic views of San Francisco.
A trail event in Cool, CA on Dec 12, 2026 offering a 50K and Half Marathon with aid stations, GPX maps, finisher medals, and a 200-runner limit.
Timed 6 and 12 hour loop trail races on a ~1.5 mile singletrack near Ramona with a single aid station and limited entries for SURF members.
A point to point half marathon on the Southside Trail at Folsom Lake featuring mostly single track, an overall ascent of 1,683 ft, multiple aid stations and a 4.5 hour time limit, starting at Salmon Falls and finishing at Brown’s Ravine.
Holiday themed races at Griffith Park on December 19 2026 offering 5K, 10K, 15K and half marathon distances on a shared dirt trail.
Trail running in Woodside, CA with 10K, half, 35K and 50K courses through redwoods and varied single track terrain.
Holiday trail event in San Diego on Dec 20, 2026 offering marathon, half marathon, 10K and a 6 hour hill climb with costume awards.
Trail event in Placerville on December 24, 2026 with multiple distances on the El Dorado Trail, course markings, aid stations, medals, and day-of registration.