Midwest Endurance Ultrapalooza

Osawatomie, United States • 26-27 Sep 2026

Midwest Endurance Ultrapalooza : Osawatomie, KS

Ultrapalooza is a multi-distance trail event held on the Flint Hills Trail in Osawatomie, Kansas. Distances offered include:

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

The course is an out and back route composed of single track, old railroad beds and towpath trail. The surface is flat, crushed gravel, largely straight, marked and staffed. The route crosses the Flint Hills and the eastern sections run alongside the Marais Des Cygnes River, passing bluffs, rolling farmland and riparian woodlands. The Flint Hills Trail follows portions of the Santa Fe National Historic Trail and is part of the American Discovery Trail.

Manned aid stations are fully stocked with water, Hammer nutrition products, snack foods, sandwiches, chips, candy and gels. Unmanned stations provide water only. Aid stations are placed no more than 6.0 miles apart. Time limits apply by distance, including 30 hour limits for the longest events and shorter limits for shorter distances.

All races start and finish at the Mile 0 Flint Hills trail head which serves as the race hub with crew space, restrooms, music and a food truck. Packet pickup procedures include a required Medical Information Sheet. Pacers, drop bag rules, downgrade and deferral policies, and conduct rules for using the trail are detailed for participants. Late registration is available at packet pickup and on race day; shirts and swag are not guaranteed for late entries. Visit the organization's website for the most recent information.

Race 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
Visit the organization's website for the most recent information.
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