Mammoth Cave National Park
54,012
Acres
747,000/year
Annual Visitors
Free
Entry Fee
Year-round (cave temperature constant at 54 degrees F)
Best Time to Visit
National Park Service
National Park
Mammoth Cave was established on July 1, 1941, protecting the world's longest known cave system with over 420 miles of surveyed passages and still growing. The cave has been used by humans for at least 5,000 years.
What Mammoth Cave Is Known For
World's longest cave system
420+ miles of passages
Historic cave tours
Green River corridor
Top Activities
Guided cave tours at multiple difficulty levels
Wild caving in undeveloped passages
Kayaking the Green River
Hiking above-ground forest trails
Camping
Our Complete Mammoth Cave Guide
Everything you need to plan your trip. Trails, timing, tips, and the spots most visitors miss.
Our Mammoth Cave Articles
Educational Resources
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Plan Your Visit
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