Heartland - Cassoday, KS
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Heartland Cassoday Kansas October 9-11, 2026
Heartland is a multi-distance ultrarunning event held in Cassoday, KS. Courses run mainly on backcountry gravel and dirt roads through the Flint Hills tallgrass prairie, with open range sections and limited paved road in town. The 100-mile course features rolling hills and about 6,000 feet of climb.
Distances offered include:
- 125 mile
- 100 mile
- 100K
- 50 mile
- Marathon
- Half marathon
The 125-mile option follows the historic Heartland 100 route with an added 30-mile loop near Eureka and a roving mobile aid station during the first night. The 100-mile course is largely out-and-back with under one mile of pavement. Aid, crew access, and drop bag provisions vary by distance; for example, the 100-mile course has 22 aid stations and multiple crew access points, while the 125-mile includes additional support options and map-based navigation through minimally marked sections.
A new 4-person relay divides the 100 miles into nine legs; teams choose how to allocate legs among four runners. Introductory team registration pricing and a field limit apply for 2026. Time limits are in effect for each distance, with the 125-mile event having the longest overall limit. Cassoday is located off Interstate 35, near Emporia and El Dorado, with commercial airports in Wichita and Kansas City. Visit the organization's website for the most recent information.