Trail Running calendar near Hayward 2025-2026

The Mt. Umunhum Trail Conquest-Fall will take place in San Jose on Saturday 11 October 2025. You can run between 5 and 50 kilometers.

Go Wild Marin offers a trail and wilderness navigation challenge in Corte Madera, California, with 2-hour and 4-hour options. Teams of 1 to 5 use a custom map to locate up to 24 checkpoints scattered along trails and wild areas of the Tiburon Peninsula. The event emphasizes exploration and navigatio..

Ruth Anderson Memorial Endurance Run is an annual multi-distance ultramarathon staged in San Francisco, California. Runners compete on a 4.475-mile paved bike-path loop around Lake Merced, with dirt shoulders and one aid station per loop. Each participant can pursue the event’s standard distances —..

The Napa Lapa Trail Adventure in Skyline Wilderness Park, Napa, California, is Inside Trail Racing’s first time-based event, where runners go as far as possible in a fixed time. Distances include 12-, 6-, and 3-hour options, with each 4.16-mile loop delivering about 815 feet of elevation on fire roa..

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..

The 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 four dirt-trail distances: 5K, 10K, Half Marathon, and 30K. The course features hills, potential mud a..

The California Fall Classic at Lake Sonoma will take place in Healdsburg on Saturday 18 October 2025. You can run between 55 and 100 kilometers.

Oakland Hills Trail Run takes place in Redwood Regional Park, Oakland, CA, offering three distances: 10K, half marathon (13.3 miles), and 35K (22.8 miles) through coastal redwoods, evergreens, and grasslands. The course is mainly technical dirt trails with steep hills and some non-technical fire roa..

The Quicksilver Trail Challenge is an annual trail running event hosted by the Quicksilver Running Club in San Jose, California. Held at Almaden Quicksilver County Park in the late summer/early fall, it offers a half marathon, a 10K, and a kids’ 1-mile fun run. Runners traverse the same scenic trail..

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..

ZombieRunner Halloween in San Jose, California, unfolds at Hellyer County Park along the popular Coyote Creek trail. Courses are well-marked with directional signage throughout. The Half Marathon and Marathon courses are USATF-certified.The event offers multiple distances: 5K, 10K, Half Marathon, an..

The Almaden Hills Trail Run - Fall will take place in San Jose on Saturday 1 November 2025. You can run between 5 and 50 kilometers.

The Oakland Tech 5km Fundraiser Race and 1 Mile Fun Run/Walk takes place at Joaquin Miller Park Meadow in Oakland, California. This event features a 5K trail run and a 1-mile fun run/walk, offering participants scenic views with towering trees and a course that is both enjoyable for casual runners a..

The Lake Chabot Trail Run, held in Castro Valley, California, offers a variety of distances including 8K, Half Marathon, 30K, Marathon, 50K, and a free Kid's Run for children six and under. The course begins at the Lake Chabot Regional Park Marina and loops around the scenic Lake Chabot reservoir an..

Mt. Tam Trail Run, organized by Inside Trail Racing, begins at Stinson Beach in Marin County, California, with Mt. Tamalpais offering dramatic backdrop views.Runners choose from four distances: 50K (about 30 miles), 30K (about 18.5 miles), Half Marathon (13 miles), and 10K (6.8 miles). The course mo..

Rancho Hills Trail Run takes place at the Rancho Canada del Oro Open Space Preserve in Morgan Hill, California. Distances range from 5K and 10K up to 50K, including 8M, 10M, Half Marathon, 30K, Trail Marathon, and a longer 50K. The course is very hilly, featuring single-track trails and dirt roads w..

Mermaid Trail Run – Woodside takes place at Huddart Park in Woodside, California. Runners can choose from multiple distances, including 3, 6, and 9 miles, a half marathon, a 6-hour challenge (individual or 2-person relay), as well as a kids’ Mermaid Dash and a virtual run. Participants run, hike or..

The Ripon Turkey Trail Run is a community-focused running event held in Ripon, California, at Mavis Stouffer Park along the Stanislaus River Trail. Scheduled for November 15, 2025, the race offers three distance options: 5K, 10K, and a half marathon (13.1 miles). Participants receive a custom techni..