Trail Running calendar near Windsor 2025-2026

The Mendocino Running Festival, held in Mendocino Woodlands Park, California, offers a unique running experience amidst ancient redwoods and scenic trails. Participants can choose from a 10K, half marathon, or timed 6- and 12-hour races on a challenging 6-mile loop featuring 875 feet of elevation ga..

The Diablo Trail Run takes place at Mount Diablo State Park, Mitchell Canyon Trailhead in Clayton, California. It offers distances of 4 miles, 10 miles, half marathon, marathon, 50K, and a Kids Run. The course ranges from a 4‑mile flat section to mountainous, scenic routes for longer distances, with..

Garin Park XC Challenge 2025, held at Garin/Dry Creek Pioneer Regional Parks on Garin Avenue in Hayward, California, is a 5K cross-country race described as a tough yet scenic run along the Garin Park ridge. Now in its 21st year, the event is part of the Pacific Association of USA Track & Field Cros..

The Berkeley Trail Adventure is a scenic trail running event held in Berkeley, California, within Tilden Regional Park and Wildcat Canyon. It offers four race distances: 10K, half marathon, 35K, and 50K, featuring challenging terrain with technical dirt trails, fire roads, and some asphalt sections...

Rocky Ridge in the Las Trampas Wilderness near San Ramon, California offers a challenging trail experience for three distances: half marathon, 10K, and 5K. The course climbs into the ridges with hills and rugged trails, rewarding runners with rarely-seen vistas and a lasting sense of accomplishment...

The Dick Collins Firetrails will take place in Castro Valley from Saturday 27 September 2025 to Sunday 28 September 2025. You can run between 42 and 100 kilometers.

The Pacifica Summit Run is a trail running event held at San Pedro Valley State Park in Pacifica, California. It features two race distances: a 10K and a half marathon. Runners experience scenic views from the tallest mountain on the upper San Francisco Peninsula, including stunning postcard vistas..

Celebration of Life - Trail Trek in Willits, California, is a community-focused trail running event through the Brooktrails area. It offers three options: a 5K-ish Trail Run/Walk, a Trail Half Marathon, and Par Course loops. Courses traverse mostly single- and double-track forest trails with some ma..

JP's Backyard Ultra/Hike is a grassroots ultramarathon and hike held at Skyline Wilderness Park in Napa, California. In its third year, the event features a 3.3-mile loop with 550+ feet of climbing through rocky and shaded trails. Runners and hikers may do 1 to 10 loops, starting together on the hou..

The Women's Headlands Half Marathon is a scenic 13.2-mile trail race held annually in the Marin Headlands near Mill Valley, California. Celebrating its third year in 2025, the event features a challenging course with nearly 2,000 feet of elevation gain, showcasing stunning singletrack trails, sweepi..

Reservoir Dogs Trail Run in Orinda, CA offers 10K, Half Marathon, and 35K distances with start and finish in the San Pablo Reservoir Recreation Area. The event is notable as the first trail race to completely circumnavigate Briones Reservoir on EBMUD trails, delivering rolling open fire roads, tree-..

Star City San Bruno Mountain Half Marathon & 5K, organized by the Excelsior Running Club, takes place in Brisbane, CA, on the San Bruno Mountain trails. The course is 93% on trail with about 2,400 feet of elevation gain, including a single-track downhill and sweeping views of the Pacific, Bay, and S..

The Women's Headlands Half Marathon is a trail running event held in the scenic Marin Headlands near Mill Valley, California. This race features a brand-new half marathon course that highlights the area's stunning singletrack trails, challenging climbs, and exhilarating descents, offering runners a..

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, held at Skyline Wilderness Park in Napa, California, is Inside Trail Racing’s first time-based ultrarun. Runners compete for a set amount of time rather than a fixed distance, choosing to cover as much terrain as possible within 3, 6, or 12 hours. Each loop is about 4...

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 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..