Welcome to Idaho's Mammoth Cave
Idaho’s Mammoth Cave is located eight miles north of Shoshone, Idaho, on the scenic State Highway 75. Starting May 1st, 2026, summer hours are 10 a.m. to 6 p.m., 7 days a week, including all major holidays. After Labor Day (September 7th), we will switch to weekends only (Fridays, Saturdays, and Sundays) before we officially close for the winter on Sept 29th. There is an established trail, and lanterns are provided. If you have flashlights, they are always good to bring along. Wearing a light jacket is recommended. The self-guided tour takes about 1/2 hour. You walk about 1/4 mile in and 1/4 mile out. Admission includes all three attractions – cave tour, Shoshone Bird Museum, and Richard Arthur Olsen Museum of Natural History, making it an unparalleled experience for history and nature enthusiasts exploring southern Idaho. Reservations are not required. Please arrive before 5 p.m for the last tours of the day before closing. We are not handicap accessible. Dogs are not allowed.
Shoshone Bird Museum of Natural History
The Shoshone Bird Museum of Natural History features birds from all corners of the globe, meticulously mounted and displayed to showcase their intricate colors and patterns. Also on view are butterflies of the world, fish and dinosaur fossils, animals from around the globe, pioneer artifacts, Stone Age artifacts, American Indian artifacts, and thousands of artifacts from cultures ranging from Africa to South America, among many other displays. This wealth of exhibits has earned the museum the nickname “The Smithsonian of the Desert” and is a must-see destination for any natural history enthusiast.
Richard Arthur Olsen Museum of Natural History
Carrying on our founder’s mission to educate those who want to learn more about natural objects, worldwide histories, and cultures of the past, Idaho’s Mammoth Cave recently expanded with the opening of a second museum, dubbed the Richard Arthur Olsen Museum of Natural History that he planned to share before his passing in 2019. This new addition to the complex offers visitors an even more comprehensive view of the natural and cultural history of the world. Exhibits include an amazing array of fossils, rocks, gemstones, animals, and cultural artifacts worldwide, making it one of the most fascinating stops in southern Idaho.
Cave & Museum Attractions
Idaho's Mammoth Cave
Idaho’s Mammoth Cave is, at this time, the largest volcanic cave open to the public in southern Idaho, and one of the most distinctive underground experiences in the region.
Anthropology
At the Shoshone Bird Museum of Natural History, there are plenty of opportunities to experience and appreciate cultural history from around the world.
Fossils
The fossils our museums feature create a sense of wonder and an understanding of a land before time.
Pottery & Baskets
Our museums feature pottery and baskets that were used in ancient times from all over the world.
Animals
Our museums feature exhibits that display the beauty of animals and the pertinent roles they play in nature.
Rocks & Coral
Our museums feature displays of fine rocks, minerals, coral, and gemstones from around the world.
Our Story
When you’re driving through southern Idaho on Highway 75, you’ll see the sign for “Idaho’s Mammoth Cave” eight miles north of Shoshone. If you take the time to drive the dusty mile off the highway, you’ll discover what a beautiful diamond in the rough awaits you, and what a rich history it has.
Frequently Asked Questions About Idaho's Mammoth Cave
Have questions before your visit? Idaho’s Mammoth Cave is a unique destination in southern Idaho, offering a mix of underground exploration, natural history, and outdoor adventure. Below are answers to some of the most common questions to help you plan your visit and know what to expect.
Idaho’s Mammoth Cave is a self-guided lava tube cave in southern Idaho where visitors walk through a naturally formed underground passage created by ancient volcanic activity.
Idaho’s Mammoth Cave is located at 251 W Thorn Creek Rd, Shoshone, Idaho, about 8 miles north of Shoshone along Highway 75, making it an easy stop when traveling through southern Idaho.
Yes. It’s considered one of the most unique things to do in Idaho, especially for visitors interested in lava tube caves, natural history, and outdoor exploration in southern Idaho.
Most visitors spend about 30 minutes walking through the cave, plus additional time exploring the museums at their own pace.
No reservations are required. Since the tour is self-guided, visitors can arrive during operating hours and begin when they’re ready.
Yes. The cave is a great option for families, though visitors should be prepared for uneven ground and natural cave conditions.
Idaho’s Mammoth Cave is open seasonally from May through late September, from 10 a.m. to 6 p.m., with last entry at 5 p.m.
Southern Idaho is full of unique attractions, from scenic canyon views and waterfalls to lava fields and nearby parks. If you’re planning a trip, explore our guide to the best things to do in Idaho to discover more destinations to add to your itinerary.
Looking for directions, parking details, or seasonal updates? Visit our full FAQ page to plan your trip.