Trail Running calendar near Fairfield 2026-2027

A trail race at Stevens Creek County Park in Cupertino offering a Half Marathon, 11K, and a charity 2.5-mile Lollipop Loop with aid stations and post-race barbecue.

Run through Bishop Ranch and San Ramon in this diverse racing event. Choose between a half marathon, 10k, 5k, or beer mile before enjoying unlimited tastings with your finisher medal.

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.

A 40th edition cross country meet in Golden Gate Park with an approximately 4 mile two loop course over grass, dirt, and rolling hills.

Mile Madness is a looped trail endurance event in Auburn, California, held September 18-21, 2026. Timed events run from 3 to 72 hours with a 0.75 mile loop and options including a 100 mile race plus on-site aid and amenities.

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.

Trail-based half marathon plus 5K and 10K with hills and scenic views in San Ramon on September 19, 2026; virtual entries available.

Rebels XC Challenge is an in-person cross-country meet in Carmichael CA on September 19 2026 featuring Women's, Masters Men's and Open Men's races with a listed fee of USD 30.

A family friendly 5K run in San Francisco with a scenic course from Mountain Lake Park to the USS San Francisco Memorial and post-race festivities.

Trail event in Castro Valley featuring a 100k, 50 mile, and marathon with UTMB index status and firm time limits due to park permits.

Community-supported Belmont Water Dog Run in Belmont, CA features 5K, 10K, kids' mile, a pet-friendly Fido Mile, and a virtual option on September 26, 2026.

A community ultramarathon and hike at Skyline Wilderness Park in Napa, CA, featuring a 3.3-mile loop repeated up to ten times in an hourly format to raise funds for the Pheo Para Alliance.

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.

Trail event in Auburn, CA on September 27, 2026 featuring a half marathon, 12K and 5K with sections on the Western States Trail.

Multi-day event at McNear’s Beach Park in San Rafael featuring an Olympic triathlon, relay, a kids triathlon, a trail half marathon, and a combined challenge.

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 rim with live music and free cider. Distances include a 50K, a half marathon and a 5 mile course with aid stations on the longer routes.

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 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.