Underdown Trail Races

The Underdown Trail Races, organized by IRONBULL, are grassroots trail running and mountain biking events held in Northern Wisconsin. Scheduled for August 16, 2025, participants can choose from various distances, including a 60k, marathon, and half marathon for runners, as well as mountain bike races of 111 miles, 37 miles, and 13 miles. The challenging course features singletrack trails, numerous hills, and scenic views of isolated lakes, providing a true wilderness experience.

The event emphasizes community and sustainability, with proceeds supporting trail maintenance and an after-race celebration featuring food, music, and awards for finishers. Visit the organization's website for the most recent information.