World's Fair Ultras
Knoxville, United States • 18 Apr 2026
World's Fair Ultras - April 18, 2026
World's Fair Ultras is a multi-format endurance event held in downtown Knoxville, Tennessee at World’s Fair Park. The course is a USATF-certified, flat 0.5724-mile loop situated in the park and downtown area. A central aid station is provided and there is space for individual personal aid setups.
Event options include several timed and distance formats:
- 3 Hour
- 6 Hour
- 6 Hour Ruck
- 12 Hour Day or Night
- 24 Hour
- 50K
- 50 Mile
- 100K
The 24 Hour event includes a recognition: 100 mile finishers will receive a custom Worlds Fair Ultra belt buckle. The event offers food trucks, coffee, ice cream, and music near the course and provides a YouTube livestream with real-time coverage, runner interviews, and on-course tracking.
An open ruck and weighted vest division is offered with specific weight requirements and administrative rules. Weight requirements: Men 30 lb dry, Female 15 lb dry, Boys under 15 20 lb, Girls under 15 10 lb. Weigh-in is required 30 to 60 minutes prior to the start; no weigh-in means no finisher patch. Accepted weight forms include steel ruck plates, bumper plates, or other items with weight clearly stamped. Removal or reduction of plates during the event is not authorized. Other race entries require rucksacks only. Visit the organization's website for the most recent information.