World's Fair Ultras

Knoxville, United States • 18 Apr 2026

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.

Race information

24 km
24 Hour
12 km
12 Hour Night Event
12 km
12 Hour Day Event
100 km
100k Event
50 mi
50 Mile Event
6 km
6 Hour
50 km
50k Event
3 km
3 Hour
Visit the organization's website for the most recent information.
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