City of Rocks National Reserve

The spires are carved from two very different granites. Most of the towers belong to the Almo pluton, molten rock that cooled underground roughly 28 million years ago and was later exposed and sculpted by weathering into the shapes you see. Alongside it stands far older rock, part of a complex that geologists estimate to exceed 2.5 billion years, among the oldest exposed rock on the continent.

Weathering did the rest. Water working into cracks, freezing and thawing over ages, rounded the granite into domes and hollowed it into the pockets, arches, and knobby faces that give the rock its distinctive texture and make it such prized climbing.

By the early 1840s this valley was a landmark on the California Trail, and over the following decades a great share of the more than 200,000 emigrants bound for California passed through, funneling their wagons between the towers. For weary travelers, the strange stone city was a sign they were nearing the end of the long crossing.

Many stopped to write their names. On surfaces like Camp Rock, you can still read signatures and dates left in axle grease and paint, a direct and moving trace of individual people on a journey of months. Preserving those fragile inscriptions is one reason the reserve exists.

Long before the wagons, this was and remains country of the Shoshone and Bannock peoples, who hunted and gathered across it for thousands of years, and it holds meaning for Shoshone and Paiute people, some of whom regard the area as a place of origin.

The reserve works with tribes to tell that history and to care for the landscape as a living cultural place, not only a scenic or recreational one. Visitors are asked to treat the rocks and the ground with that in mind.

For climbers, City of Rocks is a pilgrimage, with hundreds of routes from friendly slabs to demanding cracks and faces, including landmark formations like the Twin Sisters. Hikers and scramblers enjoy the same rock at a gentler pace on trails that thread among the spires.

Campsites tucked among the boulders make for unforgettable nights under dark skies. Late spring and autumn bring the best weather and color; summer afternoons are hot and exposed, and winter snow closes much of the interior road.

The closest Boutel™ stays, so you can turn this stop into an overnight. Each is a place we chose through independent editorial review, never a paid placement.

City of Rocks National Reserve, in south-central Idaho near the town of Almo, is a striking landscape of towering granite spires, domes, and rock formations rising from the high desert, some among the oldest rock in the country. Famous as a world-class rock-climbing destination, the reserve is also rich in history, as it was a landmark on the California Trail where emigrants passed and left their names in axle grease on the rocks. Along with climbing, it offers hiking, camping, scenic drives, and remarkable geology. With its granite spires, climbing, and pioneer history, City of Rocks National Reserve offers a spectacular destination in Idaho.

You can rock climb on the world-renowned granite spires and domes, hike trails among the formations, camp, drive the scenic backcountry roads, see historic emigrant inscriptions left on the rocks by California Trail pioneers, watch for wildlife, and marvel at the striking geology. Rock climbing and hiking amid the towering rocks are the highlights, along with the pioneer history. It is a paradise for climbers and a wonder for all. With its climbing, trails, history, and dramatic rock scenery, City of Rocks National Reserve offers a rewarding outdoor experience in south-central Idaho.

City of Rocks was an important landmark on the California Trail during the westward migration of the mid-nineteenth century, when thousands of emigrants bound for California passed through the striking rock formations, which served as a recognizable waypoint on the long journey. Many pioneers wrote their names on the rocks using axle grease, and some of these historic inscriptions survive today, a poignant record of the migration. The reserve preserves this heritage alongside its geology. This pioneer history adds a moving dimension to the dramatic scenery at City of Rocks National Reserve in Idaho.

The reserve is in remote high desert reached by unpaved roads, so come prepared with a suitable vehicle, water, food, and supplies, as services are limited. The high desert brings hot days, cool nights, strong sun, and little shade, so carry plenty of water and sun protection. Rock climbing is for the experienced and properly equipped, and even hikers should watch footing on the rocks and respect the historic inscriptions by not touching or adding to them. Coming prepared for the remote desert and respecting the site ensure a safe visit to City of Rocks National Reserve in Idaho.

City of Rocks National Reserve is in south-central Idaho near the town of Almo, within reach of the Twin Falls area with Shoshone Falls, the Snake River Plain, and the route toward the Sawtooth region and northern Utah. That makes City of Rocks National Reserve a spectacular stop to combine with the Twin Falls attractions and the other sights of south-central Idaho on a visit to the state.