Trail Running calendar near Windsor 2025-2026

Join the Women's Headlands Half Marathon on October 4, 2025 for a scenic trail run through the Marin Headlands. New for 2025, the route features singletrack climbs, descents and ocean views and starts and finishes in Mill Valley.

Event overview 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: 35..

Event overview 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..

Womens Headlands Half Marathon : October 4, 2025 The Womens Headlands Half Marathon is a women’s trail half marathon in the Marin Headlands. The event uses a new half marathon course that begins and ends at the San Francisco Running Company..

Explore Tiburon Peninsula trails at Go Wild! Marin in Corte Madera on October 11. Pick a 2 Hr or 4 Hr solo or team map run to find up to 24 checkpoints, then relax with refreshments and socializing.

Ruth Anderson Memorial Endurance Run is an ultramarathon held in San Francisco, California, circling Lake Merced. Runners complete a multi-lap course on a 4.475-mile paved bike path, with aid stations at the start/finish and each loop. The..

Test yourself at the Napa Lapa Trail Adventure in Skyline Wilderness Park with 3, 6 and 12 hour solo and relay options. Run a rugged 4.16 mile loop with big climbs, technical singletrack and on course aid as you race for distance.

Event overview The event is three cross-country races held at Miwok Meadows in China Camp State Park, San Rafael, CA. The races are run as a memorial to a Tamalpa Runner who died in 2000. Each race uses the same course as in 2024 and is rou..

Event overview The California Fall Classic at Lake Sonoma is a trail ultramarathon held at Lake Sonoma near Healdsburg, California on October 18, 2025. The event offers two distances: 100K 55K The 100K is a Western States Endurance Run qu..

The California Fall Classic at Lake Sonoma offers challenging 100K and 55K ultramarathon races set in the scenic wine country of Lake Sonoma, California. Known for its relentless courses featuring miles of single-track trails with stunning..

Event overview The Diablo Summit Stomp takes place on October 18, 2025, at Castle Rock Park / Mount Diablo State Park in Walnut Creek, California. The event offers four trail distances: 30K Half Marathon 10K 5K Walkers and hikers are allo..

The Running Dead 5K Fun Run in Union City, California, is a Halloween-themed community race at Civic Center/City Hall (34009 Alvarado-Niles Road). It offers a 5K open to adults and a 5K Youth option for younger runners. The course follows t..

The 27th Annual Matt Yeo Memorial Aggie XC Open, presented by the HOKA Aggies, is held at Radke Martinez Regional Shoreline in Martinez, California. The meet features three 4.1-mile cross-country races for Women, Masters Men, and Open Men,..

Event details The 2025 Napa Fall Wine Country race is the 33rd annual trail event at Bothe-Napa Valley State Park in Saint Helena, California. It is scheduled for October 25, 2025 and is limited to 300 participants. Distances offered: Mara..

Oakland Hills Trail Run in Redwood Regional Park offers 35K, half marathon and 10K on technical, hilly trails through redwoods and EBMUD lands. Chip timed with stocked aid stations and a cupless policy for a true trail experience.

The 39th Golden Gate Park XC Open, held at Lindley Meadow (30th Ave & JFK Dr) in San Francisco's Golden Gate Park, is a 5k cross-country race over grass, dirt, and rolling hills. It features Masters Women 40+ and Masters Men 40+ along with..

The Oakland Tech 5km Fundraiser Race and 1 Mile Fun Run/Walk takes place at Joaquin Miller Park Meadow in Oakland, California. This event features a 5K trail run and a 1-mile fun run/walk, offering participants scenic views with towering tr..

Mt. Tam Trail Run : November 2025 The Mt. Tam Trail Run is an inside-trail racing event held at Stinson Beach and Mt. Tamalpais State Park in Marin County, California. The event offers multiple trail distances and has a total capacity of 50..

Explore scenic trails around Lake Chabot Marina in Castro Valley with distances from 8K to 50K and a kids dash for little runners. Pre registered runners get T shirts and all finishers receive custom medals and stocked aid stations.

The Golden Gate Trail Classic will take place in San Francisco from Saturday 22 November 2025 to Sunday 23 November 2025. You can run between 15 and 50 miles.