Midwest Endurance Ultrapalooza

SEP
26-27
2026
Ultrapalooza runs on the Flint Hills Trail in Osawatomie, Kansas each September and offers a range of distances from 5K to 100 miles. The out and back courses use flat crushed gravel and feature staffed aid stations and formal time limits.
26-27 Sep 2026
100 miles 100 kilometers 50 miles 50 kilometers Marathon Half Marathon 10 kilometers 5 kilometers

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Midwest Endurance Ultrapalooza

Ultrapalooza is held in late September on the Flint Hills Trail in Osawatomie, Kansas, with the Start/Finish at the Mile 0 Flint Hills trail head. The event is part of the Kansas Super Slam of Ultrarunning Series.

Distances offered:

  • 100 Miler
  • 100K
  • 50 Miler
  • 50K
  • Marathon
  • 1/2 Marathon
  • 10K
  • 5K

The course is an out and back that uses single track, old railroad beds, and towpath trail. It crosses the Flint Hills and the eastern route runs alongside the Marais Des Cygnes River, passing prairie, rolling farmland, bluffs, and riparian woodlands. The surface is flat crushed gravel, and the route is described as mostly straight, staffed, and marked.

Aid stations are a mix of manned and unmanned sites. Manned stations are fully stocked with water, Hammer nutrition products, snack foods, sandwiches, chips, candy, and gels. Unmanned stations offer water only. Aid stations are placed no more than 6.0 miles apart.

Race logistics and rules include mandatory submission of a medical information sheet at packet pickup, time limits for each distance, pacer rules for the 100 mile, 100k, and 50 mile fields, and a no refund no transfer policy with a possible one year deferral if requested in advance. Drop bags are allowed at manned aid stations and must be clearly labeled. 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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