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Underdown Trail Races

Merrill, United States • 16 Aug 2025

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 biking options of 111 miles, 37 miles, and 13 miles. The course features challenging singletrack trails with numerous hills and boardwalks, providing a wilderness experience. The event emphasizes a fun and intimate atmosphere, with custom finisher awards, stocked aid stations, and an after-race party. Proceeds support trail maintenance and development. Visit the organization's website for the most recent information.

United States Wisconsin Merrill

Race information

Website
111 mi
111 Mile
60 km
60k
37 mi
37 Mile
42 km
Marathon
21 km
Half Marathon
13 mi
13 Mile
Visit the organization's website for the most recent information.
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