Trail Running calendar near Modesto 2025-2026

Diablo Trails Challenge is a trail-running event held at 1700 Castle Rock Road, Walnut Creek, CA, in support of Save Mount Diablo. The race offers multiple distances to suit all levels: 50K, half marathon, 10K, and 5K, plus a Remote Runner option. The course traverses Mount Diablo’s open-space trail..

American River Endurance Runs is a three-race ultra series from Folsom to Auburn, California, along the scenic American River Parkway. The flagship AR50 has become the second-largest 50-mile race in the United States, attracting veterans and newcomers, with companion 25- and 10-mile events finishing..

Badger Cove Half Marathon/10K/5K 2026 is held at Del Valle Regional Park in Delvalle, Livermore, California. The emerald hills of Lake Del Valle form the backdrop for three races: a half marathon, 10K, and a 5K, with a virtually hill-free 5K option when conditions permit. The event, hosted by Brazen..

Trailquake 2026 is Brazen Racing’s trail event at Sanborn Park, 16055 Sanborn Rd., Saratoga, CA. It offers 5K, 10K, and half-marathon distances. Runners traverse redwoods and pines on spectacular single-track trails, with ascents to peaks that reward you with panoramic views.The course suits all lev..

Wild Rose Half Marathon & 5K is a brand-new spring running event in Roseville, California, starting and finishing at Moksa Barrel House. Runners can choose a flat, fast Half Marathon on the Pleasant Grove Bike Path—a forked out-and-back with under 240 feet of elevation gain—and a 5K loop through Wil..

Run for Amma is an annual charity running event held at Skyline Ridge Open Space Preserve in Los Gatos, California, celebrating its 15th anniversary in 2026. The event offers three race distances: a challenging 50K with 5,266 feet of elevation gain, a 30K with 3,629 feet of elevation gain, and a 10K..

Wildcat 2026, held at 3800 Clark Road in El Sobrante, California, offers a Half Marathon, 10K, and 5K. The page highlights spectacular 360-degree views of the Bay Area from the course. Specific route details aren’t described, but the event is run by Brazen Racing and takes place within East Bay Regi..

Nitro Trail 2026 is a trail-running event held at Point Pinole Regional Shoreline Park, 5551 Giant Highway, San Pablo, California 94806. It offers three distances: a half marathon, 10K, and 5K, appealing to a range of runners and walkers. The event is branded with an energetic theme, described as an..

Toro Park Trail Run, part of the Monterey Spartan Trail weekend, takes place in Salinas, California. Runners explore Toro Park’s scenic Bay Area terrain, featuring rolling golden hills, sparse coast live oaks for brief shade, and smooth trails that roll up and down through pastures and arroyos. Dist..

Bay Area 100 is a 100-mile ultramarathon held in Oakland, California. The race is associated with a location at 12500 Campus Drive in the Bay Area, indicating the event’s hub in Oakland. The official site bayarea100.com provides registration details, noting that registration opens on October 1, 2025..

The Shadow of the Giants is an annual trail running event held in Fish Camp, California, just outside Yosemite National Park, featuring 50k and 20k distances. Set in the scenic Sierra National Forest, the race offers a challenging course with aid stations spaced 5-7 miles apart, stocked with a varie..

Skyline 50K Endurance Run is one of the oldest continuously running 50k races in the United States. The course starts and finishes at Lake Chabot Marina in Castro Valley, California, and follows a large loop through East Bay Regional Parks out to Skyline Gate. The event is popular with first-time ul..