Trail Running calendar near Monterey County 2025-2026

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..

Join the Quicksilver Trail Challenge at Almaden Quicksilver County Park in San Jose on Oct 25, 2025. Pick a scenic half marathon, 10K, or free kids one mile and explore single track trails with sweeping Mt Umunhum views.

Event overview The Haunted Hills 5K & 10K is a Halloween-themed walking and running event in Redwood City, CA, on October 25, 2025. It is organized as a trick-or-treat style course for adults and families. Participants form teams of 1 t..

Event details The Almaden Hills Trail Run - Fall takes place on November 1, 2025 in San Jose, California. The event is based at Almaden Quicksilver Park in the Almaden Valley area, with a listed location of 19535 Mockingbird Hill Lane. Regi..

Run into Halloween at Hellyer County Park in San Jose featuring distances from a 50 yard kids dash to 5K, 10K, Half Marathon and Marathon. Certified courses, costumes, finisher medals and stocked aid stations make it a fun challenge for all..

Enjoy scenic redwood trails at Huddart Park with distances from 3 Mile to Half Marathon, plus a family Mermaid Dash for kids. Try the festive 6 Hour Challenge to see how many 3 Mile loops you can cover, or join virtually.

Challenge yourself at the Rancho Hills Trail Run in Rancho Cañada del Oro Preserve, Morgan Hill, on November 8 2025 with distances from 5K to 50K. Expect steep climbs, oak shaded creek sections, panoramic views, aid stations and a finisher..

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.

Last One Standing at Smith Ranch is an elimination loop race where runners run a 4.18 mile loop each hour and must finish and be in the start corral to continue. Compete for a western buckle amid campfire vibes.

Tierra Redonda Mountain Trail Run : November 14-16, 2025 The Tierra Redonda Mountain Trail Run takes place at Smith Ranch in Bradley, California. The event offers multiple race formats over the weekend: 48 hour, 24 hour, 20 km, 10 km, and 5..

The Zoom Turkey Trot is a Thanksgiving Day running event held at Hellyer County Park in San Jose, California. It offers multiple race distances including 5K, 10K, and a USATF-certified half marathon, with additional age-specific categories..

Run Quarry Turkey at Quarry Lakes for fast, mostly flat trails with distances from 5K to half marathon plus a free Little Turkeys kids run. Family friendly, costume friendly, free photos and donations support Alameda County Food Bank.

Event overview ZombieRunner Quarry Lakes takes place on Saturday, December 6, 2025, in Fremont, CA at Quarry Lakes Regional Recreation Area (Ensenada Pavilion). The event includes multiple distance options: 5K 10K Half Marathon 30K Maratho..

Explore scenic, hilly single track at Calero County Park in San Jose with distances from a kids run through 50K, on December 6, 2025. Enjoy challenging dirt trails, marked courses, and a commemorative medal for all finishers.

Run scenic single track trails through redwood and pine groves at Summit Rock in Sanborn Regional Park near Saratoga, CA. Choose 5K, 10K or half marathon, enjoy park peak views, walk if needed, and take home a custom finisher medal.

Run the Woodside Ramble on December 20, 2025 at Huddart County Park, choosing from 10K up to 50K on scenic, marked trails with full aid stations and chip timing. Limited to 400 runners for an intimate, challenging race day.

Ring out the year with Almost New Year's Eve at scenic Lake Chabot in Castro Valley on 12/27/25. Trail routes for runners, walkers and hikers include 5K, 10K and half marathon distances with free post race photos.

Ring in the New Year at scenic Lake Chabot with Brazen Racing, choosing a half marathon, 10K, 5K or remote option. Trail climbs, free photos by volunteers and a hiker start make for a memorable day.

Run the hills of Almaden Quicksilver Park with distances from a kids run and 1 Mile to a bold 50K. Marked trails, aid stations, drop bags for ultras and medals for all finishers make it a scenic, well supported trail day.

Event overview The Crystal Springs Trail Run takes place on Sunday, January 18, 2026, at Huddart Park (Werder Shelter), 1100 Kings Mountain Road, Woodside, CA 94062. Distances offered: 8K Half Marathon 35K Marathon 50K Kid's Run (6 years a..