Heartland - Cassoday, KS

OCT
9-11
2026
Experience the vast Flint Hills tallgrass prairie in Cassoday, Kansas, with a variety of endurance distances ranging from a half marathon to a 125 mile ultramarathon.
9-11 Oct 2026
125 miles 100 miles 100 kilometers 50 miles 26 miles 13 miles

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Event Overview

The Heartland event takes place in the Flint Hills tallgrass prairie of Cassoday, Kansas. The courses primarily utilize backcountry gravel and dirt roads, with less than one mile of paved surface on the longest routes. The terrain features rolling hills, providing approximately 6,000 feet of elevation gain for the 100 mile distance. Participants run through open range land where livestock may be present on the course.

Distance Options

The event offers several endurance distances:

  • 125 mile: A graduate-level course starting Friday with a 30-mile detour loop and minimal course markings.
  • 100 mile: An out and back course on gravel roads.
  • 100 mile 4-Person Relay: A nine-leg relay for teams of four.
  • 100 km: An out and back route to the Texaco Hill aid station.
  • Teter Rock 100 km: An out and back course including a detour to Teter Rock.
  • 50 mile: An out and back route to the Teterville Road aid station.
  • Marathon: A point-to-point course starting in Cassoday and finishing at Teterville Road.
  • Teter Rock 1/2 Marathon: An out and back course starting and finishing at Teterville Road.

Logistics and Regulations

The event provides multiple aid stations across all distances, with the 100 mile race featuring 22 stations. Drop bag services are available at manned locations. For the Marathon, a shuttle service operates between the finish at Teterville Road and the start in Cassoday. Pacers are permitted for specific distances starting from the Matfield Green aid station. Due to the presence of cattle, dogs are strictly prohibited on the course. All participants must carry a hydration device. Visit the organization's website for the most recent information.

125 mi
125 Mile
100 mi
100 Mile
100 mi
Heartland 100 - 4 Person Relay
100 km
Teter Rock 100k
50 mi
50 Mile
26 mi
Cassoday Marathon
13 mi
Teter Rock 1/2 Marathon
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