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Mt. Umunhum Marathon

Name: Mt. Umunhum Marathon
Start: 2025-09-20
End: 2025-09-20
Location: San Jose

San Jose, United States • 20 Sep 2025

The Mt. Umunhum Marathon, Race to the Top and Down, is a challenging trail running event held in Almaden Quicksilver County Park, San Jose, California. This marathon features a rugged course that begins at the Hacienda Entrance and ascends to the summit of Mt.

Umunhum, one of the prominent peaks in the South Bay Area. Runners then descend back to the starting point, experiencing the scenic beauty of the park and surrounding hills. The race offers a unique adventure through natural terrain, combining elevation gain with stunning vistas.

It is a full marathon distance and provides race day registration and bib pickup. Visit the organization's website for the most recent information.

United States California San Jose

Race information

Registration

Marathon

Visit the organization's website for the most recent information.

Trail runs nearby

Saturday Dec 20

Woodside Ramble

Experience scenic single track trails under redwood canopy and along ridgelines at the Woodside Ramble. Distances from 10K to 50K offer a challenging, festive trail day; the event is sold out.

Saturday Dec 27

Brazen New Year's Eve

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.

Thursday Jan 1

Brazen New Year's Day

Celebrate New Year’s Day with scenic loop races at Lake Chabot, from half marathon to 10K, 5K and remote options on rolling trail terrain. Enjoy free race photos and earn a New Year Mega Medal if you also ran Brazen New Year’s Eve.

Saturday Jan 3

Hacienda Hills Trail Run - Winter

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Run scenic trails through Hacienda Hills at Almaden Quicksilver Park with distances for every level, from kids runs to ultramarathons. Take in Bay Area views, use on course aid and day of race registration, and earn a commemorative finisher..