About Killpecker Sand Dunes
North of Rock Springs, the Red Desert gives way to one of North America’s largest active dune fields. The Killpecker Sand Dunes stretch for more than 100 miles, forming a constantly shifting landscape of ridges, bowls, and wind-sculpted sand.
Their strangest feature is something visitors may hear before they understand it. Killpecker is one of the world’s rare booming dune systems. When dry sand slides down a steep slope, millions of rounded grains can move together and create a deep humming, roaring, or vibrating sound. The noise may seem to come from beneath the surface.
The dunes formed from ancient volcanic and sedimentary material carried eastward by prevailing winds. Unlike ordinary sand deposits, the polished grains are able to slide in synchronized layers, producing the unusual resonance.
Part of the dune field is protected as the Killpecker Sand Dunes Wilderness Study Area. Another section is open to off-highway vehicles and includes a large play area. Conditions are remote, exposed, and changeable, with little shade or water.
Why it’s weird: These enormous dunes can sing, hum, and boom when their sand begins sliding, turning an empty desert into a natural musical instrument.
Visitor info: The main recreation area is north of Rock Springs. Bring water, navigation, and supplies, and check Bureau of Land Management road conditions before entering the desert.