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World's Fair Ultras

Knoxville, United States • 18 Apr 2026

The World's Fair Ultras, held in downtown Knoxville, Tennessee, is a unique ultrarunning event celebrating human potential and community spirit. Set on a USATF-certified 0.55-mile flat loop at World's Fair Park, the race offers multiple distances including 3-hour, 6-hour, 12-hour (day and night), 24-hour, 50K, 50-mile, and 100K events. Participants enjoy a supportive atmosphere with a central aid station, personal aid areas, food trucks, music, and easy access from nearby hotels. The course is ideal for setting personal records or Tennessee state running records, welcoming runners of all levels to push their limits in a festive, inclusive environment. Visit the organization's website for the most recent information.

United States Tennessee Knoxville

Race information

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