Hardrock 100

Maggie Guterl has earned a reputation as one of the toughest athletes in trail running. This weekend, she'll take on one of the toughest 100-mile races.

Nick and Jamil Coury are teaming up to run the “graduate-level” 100-mile course around Colorado’s San Juan Mountains.

Check out Trail Runner magazine's author page.

The hardest 100-miler in the U.S. returns for the first time since 2018

Check out Maddie Mullen's author page.

Check out Maddie Mullen's author page.

Veterans of the Hardrock100-Mile Endurance Run in Colorado’s ragged San Juan Mountains are a different breed. The race punishes athletes with 13 mountain passes, summiting a 14,000-foot peak and more than 33,000 feet of total climbing—equal to climbing Everest from sea level (except that the low point on the Hardrock course is over 7,600 feet) and then some.

Check out Maddie Mullen's author page.

Check out Megan Janssen's author page.

8 iconic trail races from 5K to 100 miles that should be on your radar.

Check out Megan Janssen's author page.

Check out Jacky Thompson's author page.

Check out Megan Janssen's author page.

Check out Trail Runner magazine's author page.

Check out Trail Runner magazine's author page.

Check out Trail Runner magazine's author page.

Check out Trail Runner magazine's author page.

Check out Trail Runner magazine's author page.

Check out Trail Runner magazine's author page.

Check out Trail Runner magazine's author page.

Check out Trail Runner magazine's author page.

Here are some of our favorite videos videos about trail running. Be prepared - it might be hard to resist hitting the trail after you watch.

This video follows four athletes who took on an unusual challenge: skiing the snow-covered course of the Hardrock 100 Endurance Run.

A team from Run Steep Get High traveled to Colorado’s renowned Hardrock 100 to document the stories of the women who were racing it.