Nitro Trail

Pacifica Summit Run, staged at San Pedro Valley State Park in Pacifica, California, features 10K and half-marathon trail races hosted by Urban Coyote Racing. Runners enjoy postcard views of the Pacific Ocean coastline and plenty of switchbacks as they ascend the summit on the upper San Francisco Pen..

JP's Backyard Ultra/Hike is a grassroots ultramarathon and hike held at Skyline Wilderness Park in Napa, California. In its third year, the event features a 3.3-mile loop with 550+ feet of climbing through rocky and shaded trails. Runners and hikers may do 1 to 10 loops, starting together on the hou..

Dick Collins Firetrails is the 42nd annual trail event presented by Scena Performance at Lake Chabot Regional Park (17936 Lake Chabot Rd). The event comprises multiple trail races on East Bay regional trails, including sections on Dinosaur Ridge, the Garin-Chabot Trail, Skyline Gate, Reinhardt Redw..

The Star City San Bruno Mountain Half Marathon & 5K is set for October 4, 2025 in Brisbane, CA. Distances offered: Half marathon 5K The half marathon is 93% on trail with about 2,400 ft of elevation gain and includes a single-track downhill section. The 5K is mostly on trail. The half maratho..

The Women's Headlands Half Marathon is a trail running event held in the scenic Marin Headlands near Mill Valley, California. This race features a brand-new half marathon course that highlights the area's stunning singletrack trails, challenging climbs, and exhilarating descents, offering runners a..

The Reservoir Dogs Trail Run is a trail-running event on EBMUD lands around San Pablo and Briones Reservoirs near Orinda and El Sobrante, CA. The event takes place on Saturday, October 4, 2025, and offers three distances: 35K : 23.4 miles, ~2,800 ft elevation gain Half Marathon : 13.9 miles, ~1,45..