November 4-5, 2023

About the 24-Hour World Championships

World’s Toughest Mudder is the most extreme, imposing, pulse-pounding, heart-stopping 24-hour obstacle course challenge on the planet. It is the official 24-hour OCR World Championships of World Obstacle and will be held in Granbury, TX, a small town rich in unique culture, deep Texas history, and southern hospitality. Experience the entertainment and adventure on the downtown Historic Granbury Square; relax on the beach and enjoy the water of Lake Granbury; experience the excitement of everything in between. Granbury is the perfect place to hang your hat and recover after 24 hours of grueling endurance at World’s Toughest Mudder.


  • Individual Participant
  • 2-Person Teams
  • 4-Person Teams

Details on registration, ticket prices, schwag, merchandise, medals and awards can be found here.

All athletes, pit crews, spectators and entourages are subject to the World Obstacle code of ethics and codes of conduct. See the athlete and entourage conduct guide below.


FISO has adopted the  World Anti-Doping Agency (WADA) Code and World Obstacle Anti-Doping Rules are implemented to advance FISO’s continuing efforts to prevent doping in Obstacle Course Racing. Under recommendation from WADA we recommend all athletes competing in FISO World Championships undertake the WADA Athlete Learning Program about Health and Anti-Doping (ALPHA) and provide a certificate of completion prior to competing.

The Anti-Doping e-Learning platform (ADeL) is free of charge and can be done at the pace you choose. Register and complete the programme from the ALPHA link, then download your completion certificate and show it at packet-pick up. Instructions for creating an account:

  • Fill in all fields with your personal information
  • In the Sports field select “None
  • Leave the Federation / Organization field blank (do not enter anything)
  • In the Role, field enter Athlete
  • Leave the Athlete Id field blank (do not enter anything)
  • In the Name of the event, field enter FISO World Championships

The WADA prohibited substances and methods list are available for download from the World Obstacle Anti-doping page.

Athletes competing in FISO sanctioned World Championships may be subject to in-competition doping controls. Athletes who are found to have used a banned substances, whether through a positive drugs test, the biological passport system, an investigation, or public admission, may receive a competition ban. Athletes who are found to have banned substances in their possession, or who tamper with or refuse to submit to drug testing can also receive bans.


Athlete and Entourage Conduct Guidelines (pdf) Download
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