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Thunderdown in the Underdown
Merrill, WI
16, 37, & 111 mi
Still rowdy since 1989, the Underdown Trail Races are grassroots trail runs and mountain bike races in Northern Wisconsin. It’s conveniently located only 6 miles off of Highway 51 and offers racers a wilderness experience on challenging trails formed from glaciers that swept the area thousands of years ago. The course is primarily singletrack climbing hills (up to 75!) that pass by isolated lakes with dozens of boardwalks.
FALL ADVENTURES
MTB TOWNS & GRAVEL HUBS FOR FALL BIKE ADVENTURES
Discover the best places to ride when the leaves start to turn. From hidden gravel loops that make the perfect fall day trip to mountain towns that live and breathe singletrack, autumn is the season to chase crisp air, colorful forests, and unforgettable rides.
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