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Ironbull Ultra Trail

Name: Ironbull Ultra Trail
Start: 2025-09-13
End: 2025-09-13
Location: Rib Mountain

Rib Mountain, United States • 13 Sep 2025

Rib Mountain Trail Races, staged by IRONBULL in Wausau, Wisconsin, offer 50k, 25k, 15k trail runs and a kids run. The 2025 course returns to Rib Mountain State Park trails, with each distance around 10.6 miles per loop: the 15k is a single loop, the 25k is 1.5 loops, and the 50k is three loops. Runners encounter the park’s scenic, glacially eroded terrain, including twists, climbs, and hardwood forests.

Two main aid stations (top at 5 miles and bottom) plus water along the course support efforts. Finisher celebrations at the finish line feature food, music, and beer; cupless, composting, and Trail Sisters–approved event with sponsor support. Visit the organization's website for the most recent information.

United States Wisconsin Rib Mountain

Race information

Website

50 km

50k

25 km

25k

15 km

15k

Kids Run

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

Trail runs nearby

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Wausau Trail Run

An evening trail race at Nine Mile County Forest with 5K, 10K and 20K lap options on singletrack and ski trails. The looped course requires lights and provides on-course water and nutrition at key points.

Saturday Aug 15

Underdown Trail Races

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Ragnar Trail Wisconsin

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15 mi

117 mi

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Wausaultra Single, Double, Limitless

Wausau

Backyard Ultra

4 mi

8 mi

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