54,012 acres
Park Size
515,774
Annual Visitors
80 mi
Trail Miles
111
Campsites
About Mammoth Cave National Park
Mammoth Cave National Park protects the world's longest known cave system, with more than 400 miles of surveyed passageways—and more being discovered regularly. The cave formed over millions of years as slightly acidic groundwater dissolved the limestone bedrock. Above ground, the park protects a lush hardwood forest and the scenic Green River. The cave has been used by humans for over 5,000 years and contains significant archaeological resources.
Park Highlights
- Historic Tour
- Domes and Dripstones Tour
- Frozen Niagara
- Mammoth Dome
- Green River
- Big Hollow Trail
Activities
Wildlife
Visitor Information
Free (cave tours require tickets)
Entrance Fee
Spring, Fall
Best Seasons
Visitor Tips
- Book cave tours in advance, especially summer
- Cave is constant 54F year-round
- Many tour options from easy to strenuous
- Surface trails offer beautiful forest hiking
Location
Official Resources
Plan Your Trip
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