The 20 Most Challenging Hikes in America, Ranked

For true adventurers, hiking is more than a pastime—it's a challenge of endurance, skill, and determination. The trails on this list aren’t just scenic; they test your strength, strategy, and sometimes even technical abilities. From tough elevation gains to routes requiring rock climbing, these hikes push even the most seasoned outdoor enthusiasts to their limits. Ranked by the Yosemite Decimal System, from Class 1 (moderate) to Class 5 (technical climbs), this guide showcases America’s most demanding trails. Ready to push your limits? Let’s dive in.

20. South Kaibab Trail & Bright Angel Trail – Grand Canyon, Arizona

Difficulty: Class 1

This 17-mile trek takes you deep into the heart of the Grand Canyon, offering breathtaking views that most visitors never see. However, the journey is far from easy. The steep descent, relentless heat, and limited water sources make this trail notoriously tough—earning it the nickname “the death zone.” Every year, many hikers struggle with dehydration and exhaustion, leading to over 250 rescues.

The challenge doesn’t stop at the descent—the return climb is grueling, especially under the scorching sun. Proper preparation, including ample water and careful pacing, is essential. For those who take on this hike with respect and caution, the reward is an unforgettable experience of one of the world’s most awe-inspiring landscapes.