Trail Running calendar near Fairfield 2026-2027

Experience a rugged trail running weekend in California's wine country on April 11, 2026. The event offers a Western States qualifying 100K, a challenging 50K, and a women's Trail Sisters Half Marathon. All races are cupless and feature sce..

Multiple marked trail distances circle Lake Chabot reservoir in Castro Valley, from a free 50 yard kids dash to a 50K. Aid stations occur every 4 to 5 miles and the event operates cupless, so bring a personal cup or soft flask.

A women focused 10K in Auburn on April 11, 2026 featuring scenic trail loops, finisher shirts, age group awards and a raffle with four winners earning a trip to a women only running camp in Spain.

Explore the rolling hills of Cronan Ranch at the Magnolia Magic River Trail Run. This event offers a range of distances on dirt and rock trails, from a 5K to a 50K ultra. All participants receive a medal and access to aid stations along the..

Event Overview The Calistoga Mountain Run is a trail running event with distances of 50k, 35k, a half marathon, and a 10k. It starts in downtown Calistoga, California. The routes take runners onto trails and into Robert Louis Stevenson Stat..

Explore remote trails along Folsom Lake with the Outlands Endurance Races. Choose from 25K, 50K, or 50-mile distances on scenic singletrack. The event starts and finishes at Peninsula Campground in Pilot Hill.

Run the scenic trails at Lake Del Valle Regional Park in Livermore. The Badger Cove event offers a Half Marathon, 10K, and 5K on April 18, 2026, with walkers and hikers welcome. The half marathon is part of a challenging trail series.

Explore the scenic Bay Area Ridge Trail at the Horseshoe Lake Trail Run. Choose from a 5-mile run to a 50K ultramarathon on marked trails through multiple open space preserves. The event is cupless, offers aid stations, and all finishers ge..

Run for a cause at the Annadel Half Marathon in Santa Rosa's Spring Lake Regional Park. Choose from a half marathon, 10K, or 5K on scenic trails, with proceeds supporting Trione-Annadel State Park. It's a low-waste event featuring a race me..

A trail running event in San Carlos on April 18, 2026 offering 1K kids, 5K, 10K and a new 15K with substantial climbing through Big Canyon Eaton and Pulgas Ridge. Festival atmosphere at Crestview Park with timed results and awards.

Explore the forested trails of Huddart Park and Purisima Creek Redwoods on the San Francisco Peninsula. Choose from four distances, from a 10K to a 50K, on courses featuring redwood canyons and ridge-line views. All finishers get a custom m..

About the event The Canyons Endurance Runs by UTMB is an event in the historic gold-rush town of Auburn, California. It takes place in the northern California foothills of the Sierra Nevada range. The event is described as taking you back t..

The Mt. Tam Wild Boar Half Marathon & 10K is a scenic trail run on Mt. Tamalpais with ocean views. Taking place on April 25, 2026, it features half marathon and 10K distances. Participants receive T-shirts, and half marathon finishers get m..

Trail races held inside Marshall Gold Discovery State Historic Park near Coloma offer distances from a kids run to a half marathon. Courses mix singletrack, switchbacks and paved sections, with marked routes, aid stations and on-course mars..

The Miwok 100K is a classic 62-mile trail ultramarathon in the Marin Headlands, featuring over 11,000 feet of climbing. This iconic race, which starts in Stinson Beach, is a qualifier for major events like Western States.

The Folsom Lake Trail Run returns to the Browns Ravine Marina for a day of running on scenic lakeside trails. Choose from four distances, from a 10K to a 50K, with well-stocked aid stations and post-race food. All finishers earn a custom me..

This inaugural trail run takes you through Jack London's historic Beauty Ranch in Sonoma. Choose from a half marathon or 5 mile course past vineyards and into pristine hillsides. The event includes participant T-shirts and finisher medals f..

Tails & Trails is a charitable walk/run supporting an animal rescue. The event on May 3, 2026, in Windsor, CA, features a 5K and a Dogwood Dash, with a virtual option also available.

Run the forested trails of Napa Valley's Pacific Union College. Choose from 26K, 10K, or a kids' mile, with proceeds supporting college athletics. Remember to bring your own water bottle for this cupless event.

This 36th annual trail run starts at Stinson Beach and climbs into the iconic redwood forests of Muir Woods. Choose from marathon, half marathon, or 7-mile distances on a course featuring wooden ladders, staircases, and panoramic views. The..