Trail Running calendar near Yountville 2026-2027

Mountain Tiger Diablo in Clayton CA is a 12.4 mile loop to the Mount Diablo summit and back, with about 4,000 feet of climbing and descending.

Trail races of 5K, 10K, half marathon and 35K around San Pablo Reservoir on EBMUD trails, with chip timing, stocked aid stations, a cupless policy, and a 300-runner capacity.

Trail cross-country races at China Camp State Park over an approximately 4.25 mile course, part of the PA-USATF series with limited on-site parking.

Insomnia is a night trail race in the Sierra Nevada foothills offering 35K, 14K and 5K options. Courses are marked with reflective ribbons and headlamps are required; the 35K has a 5 hour 30 minute overall cutoff.

Multi distance trail running at Lake Sonoma offering 100 mile, 50 mile, marathon and 4 person relays with singletrack, aid stations, drop bags and on site camping.

Trail races on Mount Diablo near Walnut Creek on October 17, 2026 offering 30K, Half Marathon, 10K and 5K with possible mud and creek crossings.

A 5k cross country race run in two loops around Willow Hill Reservoir next to Folsom High School, part of the Pacific Association USATF Cross Country Grand Prix, with a $75 bonus for breaking an age group record.

Trail races at Almaden Quicksilver County Park include a half marathon, 10K and a kids one mile fun run with course aid stations and volunteer support.

A themed charity run and community festival on October 18, 2026 in Downtown Roseville, CA, supporting the bleeding disorders community. The day includes a timed 5K, a one mile walk, festival food, carnival games, and a remembrance ceremony.

Coastal Half Moon Bay race day with half marathon, 10K, 5K, kids and virtual options supporting Senior Coastsiders.

An endurance event at Beals Point, Granite Bay featuring hourly 4.16 mile laps until one runner remains, plus a 12 hour Mini Last Person Standing option. Aid is available at the start area and runners may set personal aid stations.

A backyard ultra at Beals Point in Granite Bay where runners run a 4.16 mile loop each hour until one remains. A 12 hour Mini format offers the same hourly lap with a fixed limit.

Trail run at Salmon Falls Ranch with a single lap 10K (10.5K) and a two lap half marathon on single track trails featuring creek crossings, climbs and views. Proceeds support the American River Conservancy.

Trail marathon, half, 10K and 5K at Bothe Napa Valley State Park on October 24, 2026, limited to 300 participants on marked single track routes.

Oakland Hills Trail Run features 10K, half marathon and 35K courses through Redwood Regional Park with technical trails, marked routes, aid stations and chip timing. The event is cupless and limited to 330 runners.

A women's trail half marathon in the Marin Headlands on October 24, 2026 featuring a new 13.6 mile course, 2,156 feet of climbing and coastal views of the Pacific and Golden Gate Bridge.

A cross-country meet at Radke Martinez Regional Shoreline on October 24, 2026 with three 4.1 mi races over grass, dirt, and path terrain.

An October fundraiser offering a global virtual challenge plus an in-person event at San Francisco’s Ferry Building. Multiple distances from 5K to 50K are available; some courses are unmarked and maps are provided. Proceeds support the Brea..

Celebrate Halloween with a trail race through San Jose Hellyer County Park. Choose from distances including 5K 10K Half Marathon and Marathon with costume prizes and certified courses.

Trail races in Almaden Quicksilver Park from 5K to 50K over hilly dirt roads and single-track, with two staffed aid stations, drop-bag service for longer distances, and a finisher medal for all participants.