City of Rocks National Reserve

City of Rocks National Reserve is a protected area in Cassia County covering roughly 14,400 acres of land shaped by granite formations and rocky outcrops. The landscape features numerous spires and monoliths jutting from the ground, with trails, climbing routes, and camping zones winding through the terrain.

From 1843 to 1882, roughly 250,000 emigrants traveled through this area on the California Trail, leaving behind carved names and wagon ruts in the rock. These marks tell the story of the massive westward migrations that shaped American history during that era.

The Shoshone and Bannock peoples hunted and gathered in this region for generations, establishing deep connections to the land that shaped their way of life. Walking through the reserve, you can sense how these communities integrated with the natural environment.

The reserve has over 700 climbing routes for different skill levels, hiking trails throughout the grounds, and spots for camping and rest. Winter brings opportunities for snowshoeing, so planning your visit around the season and your interests helps you make the most of your time.

The granite rocks here are among the oldest in North America, dating back more than 2.5 billion years to Earth's ancient past. Walking among these ancient formations gives you a direct connection to some of the planet's earliest geological history.

Location: Cassia County

Inception: 1988

Operator: National Park Service;Idaho Department of Parks and Recreation

Website: https://nps.gov/ciro

GPS coordinates: 42.07600,-113.70200

Latest update: December 6, 2025 16:01