Trail Running calendar near Fremont 2025-2026

Run the Marin Ultra Challenge on March 14, 2026 from Rodeo Beach, choosing a rugged 50 Mile or lively 50K through Marin Headlands, Mount Tamalpais and Muir Woods. Expect big climbs, technical single track and sweeping coastal views.

The Big Alta is a three day trail running festival in Marin County offering 28K, 50K and 100K routes that climb scenic ridgelines with sweeping San Francisco Bay views. Expect staffed aid, chip timing and lively post race vibes.

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.

Run a scenic 10K trail at Lake Lagunitas with roots, bridges and about 400 feet of climbing while supporting Evidence Action's Safe Water Now program. Limited to 100 runners, rain or shine, so register early for this feel good challenge.

Run a scenic half marathon through redwood woods and open hills at Skyline Ridge near La Honda, with ocean and Bay views and runnable rolling climbs. Proceeds benefit The Hatuey Project, with the director matching entries for double impact.

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.

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.

Run around Lake Chabot's scenic reservoir and rolling hills on April 11, 2026, with distances from a kids dash to a 50K ultra. Pre registered runners get shirts, all finishers earn medals, and well stocked aid stations keep you moving.

Challenge scenic, technical trails above Calistoga with 50K, 35K, half marathon and 10K options, several UTMB index races. Big climbs, remote single track and a custom finisher medal and race shirt for every finisher.

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.

Hit the trails April 18, 2026 at Skyline Ridge Open Space Preserve in La Honda for the Horseshoe Lake Trail Run, with distances from 5 miles to 50K plus a free kids dash. Enjoy Pacific and Santa Cruz Mountain views, single track terrain, st..

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.

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..

Take on the Miwok 100K in the Marin Headlands near Stinson Beach, a scenic 62 mile trail with 11,000 feet of climbing. Limited to 400 runners, the well supported, low waste event offers relay and training options plus finisher swag.

Join Angwin to Angwish, a scenic trail run through Pacific Union College woods with 26K, 10K and a 1 Mile Kids Run for ages 7 to 12. Family friendly, cupless event with race day check in and proceeds benefiting PUC Athletics.

Experience towering redwoods and coastal views at the 36th Stinson Beach Muir Woods Trail Run on May 9, 2026. Choose marathon, half, or 7 mile routes in an intimate field of 300 for a scenic, rugged adventure with T shirts and medals.