Trail Running calendar near Fairfield 2026-2027

Experience the trails of China Camp State Park with a selection of distances including a 5K 10K and Half Marathon. Participants enjoy a post race festival with beer steins custom medals and local snacks.

Trail races at Tilden Regional Park in Berkeley on September 12, 2026, offering 50K, 35K, half marathon and 10K with stocked aid stations and a cupless policy. Capacity is limited to 350 runners and the 50K has a time limit.

Trail races at Stevens Creek Reservoir include a Half Marathon, an 11K and a 2.5 mile charity Lollipop Loop with shaded single track, ridge views, aid stations and a capped field for longer distances.

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.

Experience a vibrant multi day endurance event in Auburn featuring a one mile looped course with distances ranging from six to 72 hours. Enjoy exceptional support with meals, music, and a chance to earn commemorative buckles.

Trail runs at Granite Beach on Folsom Lake with new 10 mile and 5K courses, aid stations, age group awards, a finisher beer glass and a postrace meal.

Experience the rugged beauty of Las Trampas Wilderness at Rocky Ridge 2026. Choose from 5K, 10K, or Half Marathon distances featuring significant hills and expansive vistas in San Ramon.

Three trail races at Lake Chabot Regional Park on September 26, 2026 span marathon to 100k distances. The Firetrails 50 returns to the original out-and-back course and the event carries UTMB indexing and a Pacific USATF Grand Prix designati..

JP's Backyard Ultra/Hike is a final edition event in Napa's Skyline Wilderness Park. Participants run or hike a 3.3-mile loop, choosing their own distance up to 33 miles. This free event is a fundraiser, with a suggested donation supporting..

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.

Experience a scenic trail run through the Endurance Capital of the World in Auburn, California. Choose between several distances including a half marathon that features the historic Western States Trail and No Hands Bridge.

Experience a trail half marathon on San Bruno Mountain featuring 2,400 feet of elevation gain and stunning views. Enjoy a scenic route with 93 percent trail coverage followed by a post race meal and finishers medal.

Trail races in Auburn, California along the American River Canyon offering 50K, 13.1 mile and 5 mile courses on mostly single-track trails, post-race cider perks and age-group awards, plus a charity donation program.

Test your endurance at Lake Merced in San Francisco with a scenic 4.5 mile loop course. Choose between a standard run or tackle ultra marathon distances including the 50K and 50 mile events.

Granite Head Trails & Ales Trail Races feature 6.6-mile and 11.2-mile courses. Runners get a tech T-shirt and can enjoy post-race fajitas and a beer. The event is the final race in a local trail running series.

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 in Cool, California offering 5k, 10k and a trail half marathon. Proceeds support Black Oak Mines Unified School District youth programs and a scholarship fund for Camp Taylor.

Experience the beauty of California wine country at the Sonoma Fall Classic. This event offers challenging singletrack trails and majestic lake views across distances ranging from a marathon to a 100 mile ultramarathon.

Trail races in Marshall Gold Discovery State Historic Park offer distances from a Kids Run to a half marathon on singletrack and paved sections, with marked courses, aid stations, a 4.5 hour time limit, and on site parking for a fee.

Experience the trails of Walnut Creek at the Diablo Summit Stomp 2026 featuring 30K, Half Marathon, 10K, and 5K courses. Walkers and hikers are welcome to join this trail event at Castle Rock Road.