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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, each offering unique terrain such as gravel roads and rail trails, and testing endurance in varying conditions including summer heat. For $600, runners gain entry to all four events, earning a finisher buckle at each and the option to purchase a commemorative plaque. This demanding series celebrates resilience and stamina, attracting elite ultra runners aiming to etch their names in ultra-running history. 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

Iron Will 100 - Junction City, KS

Junction City - 17 mi from Enterprise

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The Iron Will 100 in Junction City, Kansas, is a challenging ultramarathon event featuring multiple distances: 100 miles, 100K, 50 miles, 50K, and a 36-hour timed option. The course is a flat, fast river trail with approximately 75% shade, designed as out-and-back loops—ten for the 100-mile race and..

Earth Day Buckle Mania

Abilene - 5 mi from Enterprise

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The Earth Day Buckle Mania is an ultrarunning event held in Abilene, Kansas, featuring 12, 24, and 48-hour race options. Participants run on a certified 1.8228-mile paved loop through a scenic, mostly shaded private park. Runners can earn multiple buckles by reaching milestone distances: 50K, 50 mil..

Iron Will Backroads

Enterprise

Iron Will Backroads is an ultramarathon event held in Enterprise, Kansas, featuring 50K, 100K, and 100-mile race distances. The course consists of 7.7-mile loops on a mix of gravel and asphalt roads, with runners completing multiple loops depending on their chosen distance—four loops for 50K, eight..