Trail Running calendar near Fairfield 2025-2026

Tackle scenic single track through Joaquin Miller and Redwood parks with distances from 8K to 50K and a kid's dash. Marked routes, steep climbs and stocked aid stations every three to six miles make this a challenging and well supported tra..

Run the 42nd annual Lake Chabot Trail Challenge on June 7, 2026 in Castro Valley, with a scenic hilly half marathon or a 5K featuring ridge line views of Mt Diablo and the Bay. Chip timed races, finisher medals, and on site packet pick up.

Bay Area 100 is a 100 mile point to point ultramarathon from UC Berkeley to Skyline High in Oakland, tracing East Bay ridgelines, redwood forest and lake shore. Limited to 150 runners with a 33 hour cutoff for a true endurance challenge.

Run the Cool Moon Trail Races in Cool, California on June 13-14, 2026, with options from 5K to 100K on scenic single track and fire roads. Well marked routes, lively aid stations and live runner tracking make for an unforgettable trail week..

Take on a scenic 100 mile trail challenge near Cool, California featuring looped singletrack and fire roads with about 13,600 ft of climbing. Live tracking, regular aid and a handcrafted buckle await finishers.

Tackle scenic East Bay trails in the historic Skyline 50K or choose a half marathon around Lake Chabot Marina in Castro Valley. Finish with a plant based BBQ and beer while families enjoy the festive atmosphere.

Tackle rugged single track trails and steep climbs at Mammoth Bar in Auburn, California, with sweeping views of the American River Canyon. Choose a half marathon or 10K and test your trail legs at this scenic, challenging outing.

Run scenic shoreline and single track trails at Granite Beach for the Gold Rush Growler, with new 2026 courses and options of 10 miles or a 5K. Every finisher gets a beer glass and a cold local IPA for ages 21 and over.

Experience classic East Bay singletrack at Dick Collins Firetrails in Castro Valley, with 100k, 50 mile, marathon and 30k options across scenic ridges and regional parkland. Friendly aid stations, stunning views and a lively finish atmosphe..

Run scenic single track along the American River Canyon in Auburn, CA with 50K, half marathon, or 5 mile routes. Celebrate afterward at Ponderosa Cider Co with a commemorative cider glass and post race pours.

Join the 39th Ruth Anderson Memorial Endurance Run in San Francisco on October 10, 2026. Run scenic loops around Lake Merced on a certified course with 50k and 50 mile options and aid stations for a memorable autumn ultramarathon.

Join the Heart of Cool Trail Run in Cool CA for 5k, 10k or trail half marathon on scenic singletrack. Proceeds benefit local youth programs and a scholarship for a child with heart disease; enjoy a post race pancake breakfast.