Articles

Belgian Ultrarunner Karel Sabbe's Record-Breaking Pacific Crest Trail Run Showcased in New YouTube Documentary

Explore Karel Sabbe's record-breaking Pacific Crest Trail run in a riveting documentary. Jour..

Trail Running: How it Can Help Reduce Stress and Anxiety

Trail running is an effective way to reduce stress, anxiety, and improve physical and mental he..

Trail Running vs. Road Running: Which One Is Right For You?

When it comes to running, there are two primary options to choose from: trail running and road..

Calero Hills Trail Fest

Name: Calero Hills Trail Fest
Start: 2025-07-26
End: 2025-07-26
Location: San Jose

San Jose, United States • 26 Jul 2025

The Calero Hills Trail Fest, held at Calero County Park in San Jose, CA, offers a variety of trail running distances including a marathon, 30K, half marathon, 10 miler, 10K, and 5K. The courses feature challenging ascents and descents through scenic old oak groves, single track trails, and dirt paths, providing excellent heat training and panoramic views. The event emphasizes a rugged trail experience with well-marked routes, aid stations, and commemorative medals for finishers. Registration and bib pick-up occur on race day, and detailed course maps are available online. This festival is ideal for trail runners seeking diverse distances and a challenging, picturesque course. Visit the organization's website for the most recent information.

United States California San Jose

Race information

Website Registration

26 mi

Marathon

30 km

30k

13 mi

Half Marathon

10 mi

10 Mile

10 km

10k

5 km

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

Trail runs nearby

Saturday Oct 11

Mt. Umunhum Trail Conquest-Fall

...

Event details The Mt. Umunhum Trail Conquest - Fall takes place at Almaden Quicksilver County Park, Hacienda Entrance, 21785 Almaden Rd, San Jose, CA 95120. The event offers multiple trail distances: 50K Trail Marathon 30K Half Marathon 7..

Sunday Oct 19

The Running Dead 5K - Union City

Union City - 20 mi from San Jose

5 km

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..

Saturday Oct 25

Quicksilver Trail Challenge

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.

Saturday Oct 25

Haunted Hills 10K Redwood City

Redwood City - 21 mi from San Jose

5 km

10 km

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..

Saturday Nov 1

Almaden Hills Trail Run - Fall

...

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..

Saturday Nov 1

Zombierunner Halloween

...

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..