Wyoming Cave Systems Offer Unique Underground Exploration Opportunities

Wyoming's underground sites offer diverse geology and history

Wyoming’s mountain ranges provide some of the most significant opportunities for both above-ground exploration and underground discovery in the United States, according to a report from K2 Radio. The state’s karst topography and rugged terrain have created a variety of cave systems that range from massive, navigable halls to ancient, fossil-rich sinkholes.

These underground environments serve as more than just geological curiosities; they function as historical archives and ecological landmarks. From the Ice Age remains preserved in limestone pits to the hideouts of notorious Old West outlaws, the state’s caves offer a window into both prehistoric life and American frontier history. Access to these sites varies significantly, with some requiring specialized permits or climbing gear while others remain closed to the public to protect their integrity.

The Tongue River Cave System requires permits to prevent vandalism

Located in the Bighorn National Forest near Sheridan, the Tongue River Cave System features over a mile of navigable underground passages. The environment is complex, containing an underground stream and a waterfall. However, visitors cannot simply walk in; the area requires a permit due to previous instances of vandalism that have damaged the site.

Natural Trap Cave preserves Ice Age history

At the base of the Bighorn Mountains near the Bighorn Reservoir lies Natural Trap Cave. This site is defined by an 85-foot-deep limestone sinkhole that functioned as a natural death trap for animals during the Ice Age. The biological significance of the cave is evidenced by the remains found at its bottom, which include the bones of mammoths, bison, lions, cheetahs, and bears. To protect these sensitive archaeological and paleontological resources, Natural Trap Cave is currently closed to the public.

Great Expectations Cave features massive subterranean rooms

High in the Bighorn Mountains, at an elevation of 8,500 feet, Great Expectations Cave offers a different scale of exploration. Because of its altitude, visitors must ascend the mountains before they can begin spelunking. This high-altitude karst cave contains one of Wyoming’s largest subterranean chambers, known as the Great Hall. This specific area spans 2,000 feet in length and reaches dimensions of up to 100 feet in both width and height.

Outlaw and Horse Thief caves link to frontier legends

Near Kaycee, the Outlaw Cave serves as a historical landmark associated with Butch Cassidy, the Sundance Kid, and the Hole In The Wall Gang. These figures reportedly used the cave to hide their loot and evade law enforcement. Travelers can stay at the Outlaw Cave Campground, though reaching the cave itself requires a long hike down to the Middlefork River.

Similarly, Horse Thief Cave, also located in the Bighorn Mountains, carries a reputation tied to the era of horse rustlers and outlaws. This system was used by those evading the law, and its rough terrain requires experience and climbing gear for safe travel The cave is characterized by a massive network of twists and turns.

Darby Wind Caves provide unique thermal experiences

Near Alta, Wyoming, the Darby Wind Caves offer a different sensory experience. These caves are noted for the distinct sensation of cold air moving out of the openings, a characteristic that draws visitors to the site.

Worth a look