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, rail trails, and demanding summer heat, testing runners' endurance and determination.

For $600, runners gain entry to all four races, earning a unique finisher buckle at each event. An optional commemorative plaque is available to celebrate completing the Grand Slam, making this a prestigious and rewarding ultra-running series. Visit the organization's website for the most recent information.