Trail Running calendar near Fairfield 2026-2027

Choose from 10K to 50K trail runs at Skyline Wilderness Park in Napa, featuring steep climbs, valley views and well stocked aid stations. Camping, showers and park scenery make this a perfect weekend escape for trail lovers.

Celebrate the 15th Run for Amma on May 16, 2026 at Skyline Ridge in Los Gatos. Routes from 10K to 50K welcome all paces and 100 percent of registration proceeds support UCSF Julia Carnevale Lab.

Rim Rock 50 Mile Trail Challenge in Napa Valley is a scenic yet rugged two loop course through oak woodlands and exposed ridgelines at Skyline Wilderness Park. Run solo for 50 mile glory or team up for a two person relay and tackle the terr..

Join Wildcat 2026 on May 16 in El Sobrante for scenic half, 10K, 5K and remote run options that boast 360 degree views of the Bay Area. Run for fun or support the East Bay Regional Parks Campership Program.

Run the Wild Rose Half Marathon or 5K on May 16, 2026 in Roseville, CA, finishing at Moksa Barrel House. Enjoy scenic paved bike and park paths, a finisher medal, choice of tech shirt or BOCO hat, and a Moksa drink ticket for 21 and over.

Run scenic single track trails at China Camp State Park on May 23, 2026 with half marathon, 10K and 5K options. Limited to 275 runners, course offers climbs, views of Mount Tamalpais and the bay, aid stations, shirts and finish medals.

Join Nitro Trail at Point Pinole Regional Shoreline on May 30, 2026 for scenic trail runs offering a half marathon, 10K, 5K and remote runner option. Family friendly vibes, volunteer photographers, and a fundraiser for local park campership..

Run scenic trails in Joaquin Miller and Redwood parks near Oakland, with distances from a 50 yard kids dash to marathon and 50K. Enjoy stocked aid stations, a technical Cinderella finish and shirts for preregistered runners.

Join San Mateo PALs 5K and 10K at Coyote Point on May 30, 2026 to support health and mental wellness. Race registration includes a T shirt and access to a free Wellness Fair, and the event welcomes families, strollers and dogs.

Join Dirt Circus in Mill Valley for a free community running festival with social runs, an expo, pancake breakfast and local vendors. Costumes are encouraged and the event is cupless so bring a reusable bottle.

AllWeDoIsRun hosts trail events across the Central Coast, from scenic 10 km and 30 km races to multi day ultramarathons, ride and tie contests, and run and raft adventure days. Expect rugged trails and a spirited community.

Run scenic trails at Lake Chabot on June 7, 2026 in a chip timed half marathon or 5K with ridge top views of Mt Diablo and the Bay. Presented by Castro Valley Sports Foundation as a fundraiser with finisher medals.

The Bay Area 100 is a 100 mile point to point ultramarathon across Berkeley and Oakland ridgelines and redwood forests. With about 18,000 feet of climbing and a finish on the Skyline High School track, it offers a rugged, scenic test.

Cool Moon Trail Races in Cool, California on June 13 and 14, 2026 offer two scenic loops on single track and fire roads with distances from 5K to 100K. Expect challenging climbs, live tracking, and finisher shirts and medals.

Take on the Cool Moon 100 mile endurance run in Cool, CA on June 13, 2026 over single track and fire roads with 13,600 feet of climbing across well marked loops. Finishers earn a handcrafted silver buckle and live tracking.

Rock the Loch offers 5K, 10K and half marathon around Lake Chabot with scenic but challenging trails. Live and virtual entries include a tech shirt, wooden medallion, post race snacks and a brewfest.

Run scenic single track in the American River Canyon at Blood, Sweat and Beers Trail Run in Auburn on July 26. Choose 10.5 or 5.9 miles, tackle Cardiac and Last Gasp, then enjoy a finisher medal, food and a beer for age 21 or older.

Skyline 50K runs August 2, 2026 at Lake Chabot Marina in Castro Valley, featuring a scenic loop through East Bay Regional Parks. One of the nation's oldest 50K races, it welcomes first time ultrarunners and includes a half marathon option.

Run among towering redwoods in Oakland on August 15 at the Redwood Summer Trail Run, with distances from a 5 mile to an epic 50K plus a free kids dash. Expect stocked aid stations, finish medals and classic trail vibes.

Run scenic single track through Huddart Park, King's Mountain and Bear Gulch with options from 8K up to 50K, plus a free kids dash. Fully stocked aid stations and classic California trail views make for an unforgettable day on the trails.