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.

Run the Western Pacific on March 28, 2026 at Quarry Lakes in Fremont with half marathon, 10K, 5K and a Remote option. Enjoy mostly flat scenic trail and creekside routes on dirt and gravel, organized by Brazen Racing.

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.

Run scenic singletrack on Mount Diablo with distances from 5K to 50K, including a longer than standard Brazen Ultra half marathon. Funds support Save Mount Diablo and postrace photos and results are provided.

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.

The Woodside Crossover will take place in Redwood City on Saturday 18 April 2026. You can run between 10 and 50 kilometers.

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.

Join Tails & Trails on May 3, 2026 in Windsor, CA for a charitable walk and run supporting Dogwood Animal Rescue. Choose a 5K, the family friendly Dogwood Dash, or participate virtually while helping animals in need.