The Rocky Mountain Slam Series is an elite trail running challenge that pushes ultra-runners to their limits across five iconic 100-mile races in the rugged landscapes of the Rocky Mountains. To complete the Slam, athletes must finish four of the following five races in a single calendar year:

1. Bighorn Trail Run (June, Wyoming): This race winds through the stunning Bighorn Mountains, with runners navigating steep ascents, technical terrain, and beautiful scenery in the Bighorn National Forest. It’s both a Rocky Mountain Slam and a UTMB World Series qualifier. Learn more about the Bighorn Trail Run ​(Strambecco).
2. Hardrock 100 Endurance Run (July, Colorado): A legendary race in the San Juan Mountains, featuring more than 33,000 feet of climbing at elevations above 11,000 feet. Known for its brutal terrain and altitude, this race is considered one of the toughest in the world. More about Hardrock 100 ​(Strambecco).
3. Leadville Trail 100 (August, Colorado): Known as the “Race Across the Sky,” this high-altitude race covers 100 miles through the Colorado Rockies, challenging runners with long climbs and unpredictable weather. Finishing in under 30 hours earns participants the coveted Leadville buckle. Explore Leadville Trail 100 ​(Strambecco).
4. Wasatch Front 100 (September, Utah): This technical race takes place in Utah’s Wasatch Range, featuring steep climbs, ridgelines, and deep canyons. Known for its scenic beauty and difficulty, it’s the final challenge for many Slam participants. Details on Wasatch Front 100.
5. The Bear 100 (September, Utah/Idaho): This race is a rugged journey through the Bear River Range, offering 100 miles of forested trails, remote terrain, and significant elevation change. It’s the last race in the Slam, testing participants’ endurance after a season of ultra-running. Find out more about The Bear 100​ (Strambecco).

These races are known for their high-altitude challenges, breathtaking views, and the perseverance required to finish. Completing the Rocky Mountain Slam is a remarkable achievement that demonstrates incredible endurance and mental fortitude.