Iron Will Grand Slam

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.