Marin Ultra Challenge

The Marin Ultra Challenge, our premier Marin County long distance trail race, delivers ample hills and sweeping descents. 2026 marks the 13th edition of this tour of some of Marin’s best trails (we lost a couple years due to the pandemic). Meticulous effort went into the design of each course for the MUC; both distances are physically demanding (the 50 Mile has just about 11,000 feet of elevation gain) and exceptionally beautiful. The journey begins at the black sands of Rodeo Beach, and traverses the Marin Headlands, Stinson-facing Mt. Tamalpais and Muir Woods, exhibiting a range of terrain, from exposed fire-roads with incredible coastal and inland views to tight, technical single-track with redwood canopies. There is very little trail overlap, and Jim Vernon, from The Endurables and Hydrapak, spent hours and weekends developing these spectacular custom courses–we are super excited to show it off. You’ll quickly realize why Marin County has become the ultimate trail runner’s destination.

You may also like the following events from Inside Trail:

• Next Saturday, 7th February, 05:00 am, Monterey Ultra 50 Miler in Salinas
• Next Saturday, 7th February, 06:00 am, Fort Ord Trail Run in Spreckels
• Next month, 21st February, 07:00 am, Redtail Ridge @ Lake Chabot Trail Run in Castro Valley

Also check out other Contests in Mill Valley, Trips & Adventurous Activities in Mill Valley, Workshops in Mill Valley.