Midwest Endurance Ultrapalooza

SEP
26-27
2026
Ultrapalooza stages multiple out and back trail races on the Flint Hills Trail in Osawatomie, Kansas, from 5K to 100 miles. The flat crushed gravel course features staffed and water only aid stations, defined time limits, and distance specific awards.
26-27 Sep 2026
100 miles 100 kilometers 50 miles 50 kilometers Marathon Half Marathon 10 kilometers 5 kilometers

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Ultrapalooza in Osawatomie, Kansas

Ultrapalooza is a multi-distance trail event held on the Flint Hills Trail with start and finish at the Mile 0 trail head in Osawatomie, near 1400 South Street. The event uses an out and back route that follows old railroad beds, towpath trail, and sections of single track through the Flint Hills prairie and riparian woodlands alongside the Marais Des Cygnes River. The course surface is flat, crushed gravel and is marked and staffed.

Available distances include:

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

Aid stations are a mix of manned and unmanned locations, with manned stations stocked with water, electrolyte drinks, snack foods, sandwiches, chips, candy, gels, and more; unmanned stations provide water only. Time limits vary by distance, for example a 30 hour limit is listed for the longest races and shorter limits apply for shorter distances. Pacers are allowed for the 100 Miler, 100K, and 50 Miler with distance specific rules and waiver requirements. Runners must submit a completed medical information sheet at packet pickup. Drop bags are accepted at manned aid stations with limits on number and size and must be clearly labeled. The event offers race shirts for registered runners and distance specific awards. A no refund, no transfer policy applies though deferral to the following year may be permitted under stated conditions. Visit the organization's website for the most recent information.

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