World's Fair Ultras
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Event overview
World's Fair Ultras takes place in downtown Knoxville, Tennessee, on April 18, 2026. The course is a USATF-certified loop located at World’s Fair Park and measures 0.5724 miles per lap. The event offers on-site amenities including a central aid station, space for personal aid setups, food trucks, coffee, ice cream, and music. Registration closes on April 15 at 11:59 PM ET.
Race details
Categories offered include:
- 3 Hour
- 6 Hour
- 6 Hour Ruck
- 12 Hour Day
- 12 Hour Night
- 24 Hour
- 50K
- 50 Mile
- 100K
100-mile finishers in the 24 Hour event will receive a custom World’s Fair Ultra belt buckle. Organizers describe the loop as fast and flat.
Ruck division
The 6 Hour Ruck division requires weighted packs. Required dry weights are:
- Men: 30 lb
- Female: 15 lb
- Boys under 15: 20 lb
- Girls under 15: 10 lb
All ruck participants must weigh in 30 minutes to 1 hour before the start. No weigh-in means no finisher patch. Acceptable weight forms include steel ruck plates, weight vest blocks, bumper plates, or stamped sand weight. Weight may be checked at any time and removal or reduction of weight during the event is not authorized. Finisher patches are issued when a participant finishes or taps out, subject to weight verification. Visit the organization's website for the most recent information.