Trail Running calendar near Fairfield 2025-2026

The event is a time-based trail run held at Skyline Wilderness Park in Napa, California. Runners compete to cover as much distance as possible within a chosen time limit. The event capacity is 400 participants across all options. 12 Hour 6 Hour 3 Hour The course is a loop of 4.16 miles with appr..

The John Lawson Tamalpa Challenge is a three-race cross-country event held at Miwok Meadows in China Camp State Park, San Rafael, California. Each 4.2-mile course follows rolling single-track trails with about a quarter-mile on asphalt, starting near the Miwok Meadows gate and finishing in the Miwok..

Vampire Run - Unite for Bleeding Disorders is held in Roseville, CA, at Vernon Street Town Square in Downtown Roseville. It features a first-ever 5K on the Roseville trails, offered as a timed run with adult 5K and child 5K (under 14) and adult and child 1-mile options. The event fosters a festive,..

California Gold Rush Trail Run - Fall, Oct 18, 2025, is set in Marshall Gold Discovery State Historic Park in Coloma, CA, about 40 miles from Sacramento. The event offers Kids Run (1 mile) plus 5K, 10K, 15K, and half-marathon distances, all within the historic site that sparked the gold rush of 1848..

Willow Hills XC Open is the Buffalo Chips Running Club’s 16th annual cross-country race held in Folsom, California, near Folsom High School. The event features a single 5K course run in two laps around a water reservoir adjacent to Folsom High School, characterized by rolling hills. Runners compete..

The California Fall Classic at Lake Sonoma offers two ultramarathon distances: 100K and 55K, run at Lake Sonoma near Healdsburg, California. The weekend features on-site camping, live music, and local food, wine, and beer, with proceeds supporting the Children of Vineyard Workers Scholarship Fund. R..

The California Fall Classic at Lake Sonoma offers challenging 100K and 55K ultramarathon races set in the scenic wine country of Lake Sonoma, California. Known for its relentless courses featuring miles of single-track trails with stunning lake views, the event takes place in the fall, providing coo..

Diablo Summit Stomp is a Brazen Racing trail race in Walnut Creek, California, starting at Castle Rock Park and venturing into Mount Diablo State Park toward the summit. Runners can choose from 30K, half marathon, 10K, or 5K, all on dirt trails with hills and potential mud or creek crossings dependi..

The Running Dead 5K Fun Run in Union City, California, is a Halloween-themed community race at Civic Center/City Hall (34009 Alvarado-Niles Road). It offers a 5K open to adults and a 5K Youth option for younger runners. The course follows the Alameda Creek Trail from City Hall and returns to the fin..

Heart of Cool Trail Run is held in Cool, California (860 Cave Valley Rd, Cool, CA 95614) on Sunday, October 19, 2025. The event offers three trail distances: 5k Trail Run/Walk, 10k Run/Walk, and Trail Half Marathon. The course winds through premier Sierra Foothills trails around Cool, sharing the sa..

Wise Villa Fall Harvest Run is a 5k chip-timed race/walk staged at Wise Villa Winery in Lincoln, California. The two-loop course starts and finishes at the winery, winding through the property with spectacular views; the route is described as hilly with uneven terrain, suitable for runners and walke..

Oakland Hills Trail Run, staged in Redwood Regional Park just east of downtown Oakland, offers three distances: 35K (about 22.8 miles), a Half Marathon (13.3 miles) and a 10K. Runners traverse a lush coast redwood forest and other parklands on a mix of technical dirt trails and non-technical fire ro..

The Quicksilver Trail Challenge, hosted by the Quicksilver Running Club in San Jose, California, is an annual trail running event held in late summer or early fall at Almaden Quicksilver County Park. It features a half marathon, a 10K race, and a free one-mile kids' fun run. The courses traverse sce..

2025 Napa Fall Wine Country Marathon, Half Marathon & 10K takes place in Bothe-Napa Valley State Park along Saint Helena Highway in Saint Helena, CA. The course uses lush single-track trails with hills, streams and rocky sections, delivering a rugged and rewarding challenge, set just minutes from Na..

The 27th Annual Matt Yeo Memorial Aggie XC Open, presented by the HOKA Aggies, is held at Radke Martinez Regional Shoreline in Martinez, California. The meet features three 4.1-mile cross-country races for Women, Masters Men, and Open Men, all run on a course with grass, dirt, and path footing. The..

Haunted Hills 10K, held in Redwood City, California, blends Halloween fun with a competitive run on October 25, 2025. Runners choose the 10K or 5K course, weaving through neighborhoods decorated for the season. Participants form teams of 1–5 and carry headlamps or flashlights.It's trick-or-treating..

The 39th Golden Gate Park XC Open, held at Lindley Meadow (30th Ave & JFK Dr) in San Francisco's Golden Gate Park, is a 5k cross-country race over grass, dirt, and rolling hills. It features Masters Women 40+ and Masters Men 40+ along with Open Women and Open Men, and serves as the USATF Masters 5k..

ZombieRunner Halloween is held at Hellyer County Park (Buena Vista Pavilion) in San Jose, CA, along the Coyote Creek trail. The event features distances of 5K, 10K, Half Marathon, and Marathon, plus youth options: 5K for under 12, 5K and 10K for ages 13-17, and a free Kid's Run (6 and younger, 50 yd..

Rio Del Lago 100 Mile Endurance Run is a premier ultramarathon held at Beal’s Point in the Folsom Lake State Recreation Area, about 40 minutes east of Sacramento. The event features a 100‑mile race and a 50K endurance run, both looping from Beal’s Point toward Auburn and back along the American Rive..

Almaden Hills Trail Run - Fall takes place in Almaden Quicksilver Park in San Jose, California. The event offers multiple distances: 50K, Trail Marathon, 30K, Half Marathon, 8 Mile, 10K, and 5K, appealing to a wide range of runners. The course combines 60% dirt roads and 40% single-track trails, and..