Red Mountain Wilderness, Protected wilderness area in Washington County, Utah.

Red Mountain Wilderness is an 18,729-acre protected area named for Red Mountain, a block of Navajo sandstone bounded by the Gunlock Fault on the west and by the Santa Clara River valley and Snow Canyon on the south and east. It lies six miles northeast of St. George, with Snow Canyon State Park along its east border and the Shivwitz Indian Reservation to the southwest.

The area contains seven archaeological sites showing evidence of Southern Paiute settlements within its boundaries. Artifact distributions suggest long-term use and occupation of this landscape by indigenous peoples.

The name comes from Red Mountain, a block of Navajo sandstone bounded by the Gunlock Fault and the Santa Clara River valley. Seven documented Southern Paiute sites lie within the wilderness, and the BLM estimates archaeological site densities of 4 to 40 per square mile, so walkers should leave any flakes or potsherds in place.

The wilderness lies six miles northeast of St. George, bordered by Snow Canyon State Park to the east and the Shivwitz Indian Reservation to the southwest. Access is by unpaved roads off Utah State Route 18; no maintained trail system or facilities exist inside the boundary. Carry all water, as summer heat is severe and shade is scarce.

The black basalt flows visible in this area result from volcanic activity that creates sharp contrast with surrounding red sandstone formations. This geological contrast forms an unusual visual feature that catches many visitors by surprise.