Field is limited to 250 racers for the 50k and 300 racers for the 15k. Cancellation policy - all race purchases are final and no refunds/transfers will be given for any reason. The IRONBULL™ Ultra Trail races will take place shine or shine or snow and only will be canceled if racer safety may be compromised.

50k Fees:

Prior to 8/1/19

8/1/19 - 8/30/19

9/1/19 - 9/14/19

9/15/19 - 10/2/19

 15k Fees:
Prior to 8/1/19

8/1/19 - 8/30/19

9/1/19 - 9/14/19

9/15/19 - 10/2/19

*$15 discount if no hat

Trucker hat limited to 150 racers

What’s included:
Race Aid Stations
Swag Bag Goodies (restaurant and hotel discounts)
Finisher Award
Drink Ticket (tear off on bib)
Post-race Meal (tear off on bib)
Access to YMCA (including showers)
Access to YMCA for your family
Entry Into Raffles

A portion of your entry fee will also be donated to the Marathon County Parks Foundation.


Cash prizes to top finishers and top negative splits finishers.

Age group winners will receive free entry into any 2019 or 2020 IRONBULL™ event including IRONBULL™ Xtreme Summer Triathlon, IRONBULL™ Winter Triathlon, IRONBULL™ Ultra Trail, Rib Mountain Adventure Challenge, IRONBULL™ Gravel Ride, IRONBULL™ Paddle events.

  • 19 and under

  • 20-29

  • 30-39

  • 40-49

  • 50-59

  • 60 and over

All registered racers and volunteers eligible for raffle prizes (must be present to win).

If you unable to attend the awards ceremony, unclaimed awards will not be mailed.

IRONBULL™, Inc. is a local, not-for-profit organization with goals to support local clubs / organizations and invest in infrastructure for extreme sports in Central Wisconsin.