Ironbull Ultra Trail

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.

Race information

50 km
50k
25 km
25k
15 km
15k
Kids Run
Visit the organization's website for the most recent information.
Trail runs nearby

WausaUltra runs May 1 to 3 at Sylvan Park in Wausau WI on a scenic 4.167 mile trail loop with a Limitless last runner standing format plus Solo and Double options. Trail climbs, creek crossings, festival camping vibes and a free kids race.

The Dormie Challenge: 12-Hour and 6-Hour Ultra Marathon The Dormie Challenge takes place on Saturday, May 30, 2026, in Stevens Point, Wisconsin. The event offers two timed ultra marathon options: 12-hour and 6-hour. The course is a 1.01-squ..

Event overview The Wausau Trail Run is an evening trail race held at Nine Mile County Forest in central Wisconsin. Registration for the next edition opens on January 1, 2026. The event offers the following distances: 5K 10K Half Marathon..