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Iron Will Grand Slam

Enterprise, United States • 1 Jun 2025

The Iron Will Grand Slam is an ultimate ultra-running challenge held in Enterprise, Kansas, featuring four grueling 100-mile races throughout 2025. Participants tackle the Earth Day Buckle Mania, Iron Will Backroads, Honey Badger Road Race, and the Iron Will race, spanning from April to September. The courses include gravel roads and rail trails, with varying conditions such as summer heat.

For $600, runners gain entry to all four events, earning a unique finisher buckle at each race. An optional commemorative plaque is available to celebrate completing the series. This demanding series offers a rare opportunity to join an elite group of ultra runners. Visit the organization's website for the most recent information.

United States Kansas Enterprise

Race information

Registration Facebook
100 mi
Earth Day Buckle Mania 100 Miles
100 mi
Honey Badger Road Race 100 Miles
100 mi
Iron Will 100 Miles
100 mi
Iron Will Backroads 100 Miles
Visit the organization's website for the most recent information.
Trail runs nearby

Earth Day Buckle Mania

Abilene - 5 mi from Enterprise

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Earth Day Buckle Mania is an ultrarunning festival in Abilene, Kansas, offering 12-, 24-, and 48-hour options. Runners complete laps on a certified, 1.8228-mile paved loop through a private, mostly shaded park, creating a serene, park-like atmosphere. Distances translate into buckles: 50K, 50 Miles,..

Iron Will Backroads

Enterprise

Iron Will Backroads takes place in Enterprise, Kansas. The event offers three distances—50K, 100K, and 100 mile—run on 7.7-mile loops composed of gravel and asphalt. The 100 mile option requires 13 loops, 100K eight loops, and 50K four loops.Each loop has a full aid station at the start/end with sta..