Trail Running calendar near Redwood City 2025-2026

The Spartan Trail - San Jose Trail Challenge takes place at Sanborn County Park in Saratoga, California, nestled on the eastern slopes of the Santa Cruz Mountains. This scenic event offers challenging trail runs with big climbs and fast descents on well-groomed, flowy singletrack trails through dens..

The Big Sur Trail Marathon, Half Marathon, and 5 Mile race is held annually at Andrew Molera State Park in Big Sur, California. Celebrating its 35th year in 2025, the event features challenging courses along the scenic Old Coast Road, offering stunning views of the California coastline. The marathon..

The Star City San Bruno Mountain Half Marathon & 5K, held in Brisbane, California, offers a scenic trail running experience with spectacular views of the Pacific Ocean, San Francisco Bay, and the city skyline. The half marathon course is 93% trail, featuring 2,400 feet of elevation gain and a thrill..

The Reservoir Dogs Trail Run in Orinda, CA, offers 10K, Half Marathon, and 35K distances around the scenic Briones Reservoir on East Bay Municipal Utility District (EBMUD) trails. This event features a mix of rolling fire roads, tree-covered single-track, and expansive views of watershed lands, prov..

The SFRC Women's Headlands Half Marathon is a scenic trail running event held in the Marin Headlands, starting and finishing at Rodeo Beach near Sausalito, California. The race features a challenging 12.6-mile half marathon with 2,494 feet of elevation gain, alongside a 6-mile 10K option. Both cours..

The Ruth Anderson Memorial Endurance Run is a prestigious running event held annually in San Francisco, California, since 1986. This endurance race features multiple distances, including 50 miles, 100 kilometers, and 50 kilometers, attracting runners of various skill levels. The course consists of a..

The Mt. Umunhum Trail Conquest-Fall is a trail running event held at Almaden Quicksilver County Park in San Jose, California. The race offers multiple distances including a 5K, 7 Mile, Half Marathon, 30K, Trail Marathon, and 50K.The longer courses venture into the scenic Sierra Azul Open Space Prese..

Go Wild Marin 4 Hr is an adventurous trail and wilderness scramble held on the Tiburon Peninsula in Corte Madera, California. Participants compete individually or in teams of up to five, navigating a custom map to locate as many as 24 checkpoints scattered across trails and wild areas within a four-..

The Napa Lapa Trail Adventure, hosted by Inside Trail Racing, is a unique time-based trail running event held at Skyline Wilderness Park in Napa, California. Participants run as far as possible within set time frames of 3, 6, or 12 hours on a 4.16-mile loop featuring approximately 815 feet of elevat..

The Skyline Wilderness Endurance Trail Run takes place in Skyline Wilderness Park, Napa, California, featuring a challenging course with over 815 feet of elevation gain per 4.1+ mile loop. Participants can choose from 12-hour, 6-hour, or 3-hour race options, running as many laps as they can within t..

The Diablo Summit Stomp is a trail running event held in Walnut Creek, California, featuring distances of 30K, half marathon, 10K, and 5K. The courses traverse dirt trails starting from Castle Rock Park and extend into Mount Diablo State Park, with the 30K reaching the summit of Mount Diablo. The ev..

The Haunted Hills 5K & 10K in Redwood City is a festive running event featuring a Halloween-themed adventure through decorated neighborhoods. Participants, in teams of 1 to 5, use headlamps or flashlights to navigate approximately 20 checkpoints for the 5K or 36 for the 10K, answering simple questio..

The Oakland Hills Trail Run, held at Redwood Regional Park in Oakland, California, offers challenging trail races in three distances: 10K, half marathon, and 35K ultramarathon. Set in a serene redwood forest with towering 150-foot coast redwoods, the course features technical dirt trails and fire ro..

The Napa Fall Wine Country Marathon, Half Marathon & 10K is an annual trail running event held at Bothe-Napa Valley State Park in Saint Helena, California. Now in its 33rd year, the race features challenging courses through lush single-track trails with hills, streams, and rocky terrain, offering a..

The ZombieRunner Halloween event is a festive running competition taking place in San Jose, CA, featuring a variety of race distances including a 5K, 10K, Half Marathon, and Marathon, along with youth categories and a free Kid's Run. Participants are encouraged to dress in Halloween costumes for a c..

The Almaden Hills Trail Run - Fall takes place in Almaden Quicksilver Park, located in the scenic Almaden Valley near San Jose, CA. This trail running event offers a variety of distances including 50K, Trail Marathon, 30K, Half Marathon, 10K, 8 Mile, and 5K races. The course features a mix of approx..

The Oakland Tech 5km Fundraiser Race and 1 Mile Fun Run/Walk is set to take place at Joaquin Miller Park, supporting the Oakland Tech Cross Country and Track Team. This event features a scenic 5K trail run and a 1-mile fun run/walk, designed to cater to both competitive runners and leisurely partici..

The Lake Chabot Trail Run, held in Castro Valley, California, offers a variety of distances including 8K, Half Marathon, 30K, Marathon, 50K, and a free Kid's Run for children six and under. The course begins at Lake Chabot Regional Park Marina and loops around the scenic Lake Chabot reservoir and su..

The Rancho Hills Trail Run - Fall is a challenging trail running event held at the Rancho Cañada del Oro Open Space Preserve in Morgan Hill, California. The race offers a variety of distances ranging from 5K to 50K, including 10K, 8 Mile, 10 Mile, Half Marathon, 30K, and a Trail Marathon. The course..

The Mt. Tam Trail Run, held at Stinson Beach, California, offers challenging trail races including 10K, half marathon, 30K, and 50K distances. The course features a demanding climb up Mount Tamalpais with stunning views, followed by scenic trails through the Headlands, finishing back at the beach.Th..