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..

Tamalpa Headlands 50K

Name: Tamalpa Headlands 50K
Start: 2025-08-16
End: 2025-08-16
Location: Mill Valley

Mill Valley, United States • 16 Aug 2025

The Tamalpa Headlands 50K is a challenging ultramarathon held annually in Marin County, California, starting and finishing at Santos Meadow near Muir Woods. Covering 50 kilometers with about 6,500 feet of elevation gain, the single-loop course features renowned trails such as Coastal, Miwok, Steep Ravine, Matt Davis, and Dipsea. Runners experience a mix of fast fire roads, steep climbs, technical singletrack, and stunning views of the Bay Area and Pacific Ocean. The event, supported by the Tamalpa Runners and Arc'teryx, also serves as the USATF Trail 50K Championship. Aid stations are strategically placed, and the race emphasizes environmental respect and a cup-free policy. Visit the organization's website for the most recent information.

United States California Mill Valley

Race information

Website Registration

50 km

50k

Kids' One Mile Challenge

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

Trail runs nearby

Thursday Nov 27

Moraga Turkey Trot

Moraga

2 mi

5 km

Celebrate Thanksgiving at the Moraga Turkey Trot, a friendly 5K or 1.5 mile run or walk on the Moraga Country Club cart path. Advance registration is required, proceeds benefit the food bank and participants get a tee, bib and prize chances..

Saturday Nov 29

Quad Dipsea

Mill Valley

0 km

Quad Dipsea in Mill Valley puts runners on a 28.4 mile route of steep stairs and single track to Stinson Beach and back four times, with roughly 9,000 feet of climbing and stunning coastal views. It is a fierce but unforgettable day on the..

UTMB Index

Fri - Mon Dec 5-8

The Krampus Cross Country

Run Krampus Cross Country in San Francisco live on Dec 7 or virtually Dec 5 to 8 with 5K 10K and the Naughty Nine Miler. All entrants get a wooden woodallion a Krampus tee and a beer sampler stein plus a brewfest on Dec 5.

Saturday Dec 6

Inside Trail - Peacock Gap Trail Run

Peacock Gap Trail Run offers three scenic trail distances through China Camp and Harry Barbier parks near San Rafael. Expect technical singletrack, big views and well stocked aid stations; bring your own bottle or reusable cup for this cupl..