Trail Running calendar near San Ramon 2026-2027

Big Alta is a three day trail running festival in Marin County with summit routes and stunning San Francisco Bay views. Choose from 28K, 50K or a point to point 100K, all with live timing and stocked aid stations.

Run scenic single track trails, hills and streams at Bothe Napa Valley State Park in the intimate 300 runner Napa Valley Trail. Choose marathon, half marathon or 10K and get a race shirt plus finisher medals for full and half.

Run peaceful redwood trails in Oakland with distances from a kids 50 yard dash to 50K ultras, plus family friendly 5K and marathon options. Enjoy scenic singletrack, stocked aid stations and springtime forest views.

Join the Lag Bon 10K trail run in Fairfax on March 22 to celebrate World Water Day and support Evidence Action's Safe Water Now program. Limited to 100 runners, the technical 10K features stairs, roots and muddy singletrack and runs rain or..

Scenic half marathon in La Honda at Skyline Ridge, with runnable single track and fireroad through woods and hills offering ocean and bay views. Proceeds benefit The Hatuey Project and entry fees are matched to double the gift.

Join Western Pacific 2026 at Quarry Lakes in Fremont for scenic half marathon, 10K and 5K routes along the Western Pacific and Alameda Creek trails. Mostly flat trails welcome runners, walkers and remote runners.

Run scenic single track trails along Folsom Lake through oak and grass, with technical sections and shaded viewpoints. Choose from half marathon, 8 mile, 10K or 5K, grab same day registration and a commemorative medal at the finish.

Limited to 400 runners, the Golden Gate Headlands Marathon, Half Marathon and 10K invites trail lovers to Mill Valley, CA. Run single track trails and fire roads with sweeping views of the Golden Gate Bridge, San Francisco Bay and Pacific.

Take on Mount Diablo on April 4, 2026 with trail distances from 5K to 50K, including a challenging ultra half that often exceeds 13.1 miles. Organized by Brazen Racing, the event supports Save Mount Diablo and offers remote entries and post..

Run the scenic American River Parkway from Folsom to Auburn with 50, 25 or 10 mile options. Expect aid stations, a tech shirt and finisher medallion, plus a festive post race party with food and a beer garden.

Romancing the Island at Angel Island State Park offers a scenic half marathon or 10K loop with iconic Bay views. Limited to 400 runners, this intimate island race is ferry accessible and unforgettable.

Challenge yourself on scenic Lake Chabot trails April 11, 2026 in Castro Valley with distances from 8K to 50K plus a free kids dash. Looped, well marked courses offer big climbs, frequent aid stations and finisher medals for all.

Calistoga Mountain Run offers 10k to 50k trail races around Mount St. Helena, with rugged single track, fire road climbs and stunning views. Expect technical terrain, big elevation gain and limited aid so bring water and fuel.

Join Badger Cove at Del Valle Regional Park on April 18 for a scenic half, 10K, 5K or remote run around Lake Del Valle. All finishers get custom medals and shirts, chip timing, and proceeds support East Bay Regional Parks camperships.

Horseshoe Lake Trail Run features 5 mile to 50K options plus a free kids dash on scenic Skyline Ridge with Pacific views. Marked trails, stocked aid stations, and finisher medals make it a rewarding day for trail runners.

Celebrate Earth Week with trail runs through Annadel State Park at Spring Lake Regional Park in Santa Rosa. This nonprofit fundraiser features half marathon, 10K and 5K distances, low waste aid stations, and supports local park stewardship.

Join the No Foolin' Foot Race in San Carlos on April 18, 2026 with 1K kids, 5K, 10K and a new 15K route across Big Canyon, Eaton and Pulgas Ridge. Festival vibes, tech shirts, pro timing and proceeds help local trails.

Experience redwood canopy and sweeping ridge views at the Woodside Purisima Creek Crossover on April 18, 2026, with 10K, half marathon, 35K and 50K options. Limited to 450 runners, this scenic trail event features aid stations and finisher..

Join the 38th Mt Tam Wild Boar Half Marathon and 10K on April 25, 2026 at Mt Tamalpais State Park for a scenic ridge and trail run with sweeping views of Bolinas Lagoon and the Pacific. Entry is limited to 300 runners for an intimate race d..

The Miwok 100K is a 62 mile trail ultramarathon through redwoods, exposed ridgelines and coastal cliffs in the Marin Headlands. It is a demanding, well marked race with relay entries and a strong commitment to sustainability.