Trail Running calendar near Geyserville 2025-2026

Run the Lag Bon 10K on March 22 in Fairfax on a scenic, technical Lagunitas trail with roots, rocks and muddy sections. This small charity race supports World Water Day with proceeds to safe water programs and runners get a shirt and medal.

Test your limits at Bad Ass Backyard Ultra in Rio Linda March 28, 2026. Run 4.16 mile loops each hour until one runner outlasts the field; this Satellite qualifier can put you on the path to national team selection and Big's Backyard Worlds..

Join the Diablo Trails Challenge on April 4, 2026 at Mount Diablo with distances from 5K to 50K on scenic but demanding trails. A portion of entry fees benefits Save Mount Diablo and race day photos and a BBQ add to the experience.

Run with sweeping views of the Golden Gate Bridge, San Francisco Bay and Pacific Ocean on scenic trails in the Marin Headlands. Choose Marathon, Half Marathon or 10K on April 4, 2026 in a 400 runner field for an intimate coastal challenge.

Join TERREX Lake Sonoma for a weekend of scenic trails with a Western States qualifier 100K, a 50K and the Trail Sisters women only half. Enjoy lake views, big climbs, camping and cupless aid stations with shuttles to Lone Rock.

Run Angel Island on a scenic hilly loop with sweeping Golden Gate, Alcatraz and Bay views. Choose a 10K or a half that circles the island twice at the 35th annual event limited to 400 runners, ferry included.

Napa Valley Endurance Run in Calistoga on April 12 offers 50K, 35K, half marathon and 10K across scenic single track and fire roads. Expect big climbs, vineyard views, UTMB Index status and a custom finisher medal.

Run a stunning 50K along the Mendocino coast, from Big River State Park to bluffs above Mendocino Village. Expect rivers, redwood forest, waterfalls and sweeping Pacific views on a scenic trail challenge.

Run scenic trails around Annadel State Park in a community fundraiser with a half marathon, 10K and 5K. Celebrate Earth Day with cup free aid stations and help support Trione Annadel State Park and Sonoma County Parks Foundation.

Run the scenic 38th Mt Tam Wild Boar at Mt Tamalpais State Park on April 25 2026, choose the half marathon or 10K, and enjoy coastal ridge views and single track trails. Field limited to 300 so register early.

Tackle the iconic Miwok 100K through the Marin Headlands on May 2, 2026, where redwoods, ridgelines, and coastal views await. Limited to 400 runners, this supported trail ultramarathon blends rugged challenge with community and sustainabili..

Join Tails & Trails on May 3, 2026 in Windsor CA to support Dogwood Animal Rescue with a fun 5K, Dogwood Dash, or virtual option. Bring your pup for a dog friendly run and help animals in need.

Run or walk the Waves & Whales 5K on the Mendocino Coast in Point Arena, following bluffside trails through pine and cypress forest. Proceeds benefit student coastal stewardship and entrants get an organic cotton tee and handmade medallions..

Run scenic single track and dirt roads around Lake Anza in Tilden Regional Park, Berkeley, with distances from a family friendly kids dash to a tough 50K. Pre registered runners get shirts, all finishers earn custom medals and aid stations..

Run from Stinson Beach into the ancient redwoods of Muir Woods on a scenic, rugged course with ladders, staircases, streams and summit views. Choose marathon, half marathon or 7 mile on May 9, 2026; field limited to 300 runners.

Wildcat 2026 on May 16 in El Sobrante offers scenic 360 degree views of the Bay Area with race choices from 5K to half marathon or a remote option. Join the fun and help support the East Bay Regional Parks Campership Program.

Explore Napa's Skyline Wilderness Park on May 16 with 50K, 30K, half marathon and 10K trail runs through rim rock climbs and panoramic views of Mount Diablo, Mount Tam and Mount Saint Helena. Aid stations and on course support keep you movi..

Rimrock 50 Mile Trail Challenge in Napa invites solo runners and two person relay teams to tackle two scenic loops through Skyline Wilderness Park and nearby preserves. Expect staffed aid stations, on site camping, and hearty post race food..

Join Nitro Trail 2026 at Point Pinole Regional Shoreline on May 30, 2026 for scenic trail races including half marathon, 10K, 5K and a remote runner option. A separate hiker start in the half welcomes slower paces and a relaxed finish.

Explore rugged coastal trails and sweeping ridge views at Sonoma Coast Trail Runs near Duncans Mills, CA. Choose from half marathon to 50K for a challenging, scenic day on natural surface trails.