Midwest Endurance Ultrapalooza

SEP
26-27
2026
Ultrapalooza in Osawatomie KS takes place on the Flint Hills Trail and offers out and back races from 5K to 100 miles. The flat crushed gravel course has staffed aid stations and defined time limits.
26-27 Sep 2026
100 miles 100 kilometers 50 miles 50 kilometers 26 miles 13 miles 10 kilometers 5 kilometers

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Ultrapalooza : Osawatomie, KS

Ultrapalooza is an ultrarunning event organized by Midwest Endurance Race Co. held on the Flint Hills Trail in Osawatomie, Kansas. The event uses an out and back format on a mostly straight, flat crushed gravel course that follows former rail beds and towpath trail through tallgrass prairie, riparian woodlands, and farmland. The Flint Hills Trail is the longest trail in Kansas and follows portions of the Santa Fe National Historic Trail and the American Discovery Trail.

Distances offered include:

  • 100 Miler
  • 100K
  • 50 Miler
  • 50K
  • Marathon
  • Half Marathon
  • 10K
  • 5K

Manned and unmanned aid stations are provided; manned stations include water, electrolyte drinks, nutrition, sandwiches and other snacks, and are spaced no more than 6.0 miles apart. Time limits apply by distance, for example 30 hour limits for the longest events and shorter limits for the 50K, marathon and half marathon. Pacers are permitted for the 100 Miler, 100K and 50 Miler with specific mile restrictions, waiver requirements, and bib rules.

The main hub is the Mile 0 Flint Hills trail head, which serves as the start and finish area and offers space for crews, music, a food truck and restrooms. Runners must submit a completed medical information sheet at packet pickup. Drop bag rules limit one bag per person at each manned aid station and require clear labeling. The event is part of the Kansas Super Slam of Ultrarunning Series. Visit the organization's website for the most recent information.

100 mi
100 Miler
100 km
100k
50 mi
50 Miler
50 km
50k
26 mi
Marathon
13 mi
1/2 Marathon
10 km
10k
5 km
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