Everything you should know about Mammoth Cave National Park

Mammoth Cave National Park isn’t the only park with a cave beneath its surface. However, nowhere else on earth comes close to matching the scale of the park’s vast underground network, the largest cave system in the world. Above ground, the park is filled with acres of lush forests, winding rivers, and miles of hiking trails. This unique combination of scenic and subterranean wonders makes the park a destination unlike any other, with two related yet distinct experiences.  

Before it was recognized as a national park, Mammoth Cave had a rich human history. As early as 5,000 B.C.E., Indigenous peoples lived on the land, using it for shelter and extracting minerals from the soil. Later, it served as a church, tuberculosis sanatorium, and community gathering spot. Tourism in the park began around 1816, with enslaved African Americans serving as the first guides.

Congress voted to establish Mammoth Cave National Park in 1926, although formal recognition did not occur until 1941. Since then, the park has gained international recognition. In 1981, UNESCO designated the park a World Heritage Site, and in 1990, it became a UNESCO International Biosphere Reserve.

Best times to visit Mammoth Cave National Park

Because the temperature in the cave hovers around 54°F (12.2°C) year-round, there is no bad time to visit. Inside the cave, visitors can’t tell if it is a sweltering summer day or a frigid, snowy afternoon outside, says Molly Schroer, a ranger at Mammoth Cave National Park. Winter is an ideal time to explore the cave while avoiding summer crowds who flock to the park’s surface in warmer weather, she says. 

April through November is the best time to visit to enjoy all that Mammoth Cave National Park has to offer above ground and below. May is the most popular month to visit the park, followed by March and October, says John Ribes, program manager for AllTrails, Public Lands. “Plan accordingly if you're crowd-averse,” he suggests.

Where to find the best views in the park

For one of the best views in the park, head to Sunset Point to take in a panorama overlooking the Green River Valley. The view is beautiful year-round, but it is especially striking in the fall when the park’s dense canopy turns shades of deep red and gold. The trail starts at the visitor center and is easily accessible from the newly renovated 0.6-mile (0.97 km) Heritage Trail.    

Turnhole Bend Overlook offers a sweeping view of the Green River and, on clear days, Turnhole Bend Spring. The overlook is located about halfway along the 0.6-mile (0.97 km) Turnhole Bend Loop Trail. For more great views along the way, the short trail travels through a hilly forested landscape and passes large sandstone rock outcroppings and sinkholes. Seasonally, the trail is a great place to see wildflowers and the park’s unique ferns that only grow in sinkholes. 

Serious hikers will find incredible and varied views along the Green River Bluff, Echo River Springs, Sinkhole, and Heritage Trail. The 4.6-mile (7.4 km) trail starts at the visitor center before winding through lush hardwood forests. The trail’s high limestone overlooks offer some of the best views of the Green River in the park. The route also takes hikers through a massive natural sinkhole and past a turquoise spring, where a river emerges from the underground cave. Those interested in the park’s human history can visit an old pioneer cemetery and other sites related to early cave exploration and settlement. 

Underground, the Ruins of Karnak, named after the ancient Egyptian Karnak Temple, are an unusual sight that shouldn’t be missed, says Roger Brucker, the co-founder of the Cave Research Foundation (CRF), a non-profit dedicated to the exploration, research, and conservation of caves. The organization partners with the federal government to study caves on public lands. 

The Star Chamber is another stunning underground site. Smoke and soot from the torches explorers used in the cave over thousands of years turned the chamber’s ceiling black. Early cave guides threw rocks at the ceiling, revealing flecks of twinkling gypsum underneath. The effect is startling and closely resembles the night sky. “I saw or seemed to see the thick with stars glimmering over our heads. All the party were touched with astonishment and pleasure,” poet Ralph Waldo Emerson said of his experience visiting the chamber. 

Where to find the best hiking trails

Mammoth Cave National Park is home to over 85 miles (136.8 km) of surface trails and approximately 12 miles (19.3 km) of subterranean paths. With so many options, hikers are almost certain to find multiple trails that meet their ability and interests. 

The Dixon Cave, Green River Bluffs, and River Styx Spring Loop is an easy 1.7-mile (2.7 km) loop that is full of highlights. In under an hour, hikers walk along the Green River, pass Dixon Cave, reach forested bluffs, and pass the Mammoth Cave Historic Entrance. This well-shaded trail keeps hikers cool, even in the summer. 

One of the most demanding and gratifying hikes in the park is the Mammoth Creek First Creek Trail. This 12.8-mile (20.6 km) trail has nearly 1,700 feet (518.2 meters) of elevation gain. Those who push through are rewarded with views of waterfalls, lakes, wildflowers, birds, moss-covered rocks, and deep-forest solitude.

Within the cave, the Grand Avenue Tour (4 miles/6.4 km) showcases Mammoth Cave’s diversity. On this moderate hike, visitors wander through wide canyons and narrow tunnels that demonstrate the cave's geological diversity, spotting cave dwellers and passing historical sites used by humans over thousands of years along the way.

The best spots to see wildlife

Wildlife is most abundant in spring and fall, primarily along the Green River, one of the most biologically diverse waterways in the United States. “Hikers and paddlers regularly see the eastern gray squirrel, songbirds, eagles, snakes, and other creatures in the forests and along the riverways,” Schroer says. River otters, mussels, salamanders, and bats are also common near the park’s waterways. Additionally, wild turkey and white-tailed deer are common sights in the picnic areas. 

Sloan's Crossing Pond Trail (0.4-mile/0.6 km) is a great choice for wildlife viewing. “It is a short route for hikers of all abilities that offers viewing decks perfect for seeing wildlife. Check out the surface pond and see what fish, frogs, turtles, herons, and even butterflies pop into view,” Ribes says. 

Wildlife is abundant below ground, too. Mammoth Cave is one of the most diverse biospheres on Earth, home to over 200 species. Visitors may see bats, cave crickets, fish salamanders, and pack rats year-round. 

Expert recommendations and tips 

Brucker’s first trip to Mammoth Cave National Park at age seven left such an impression that he made exploring and preserving the cave his life’s work. As an adult, he mapped unexplored portions of the cave and continued mapping until he was 96. Brucker has also authored four books about Mammoth Cave.

“So much of Mammoth Cave has not been seen by humans; it’s hidden underground. There is no other national park with so many square miles of undiscovered territory. Explorers are still finding new passages,” he says. Brucker recommends spending as much time in the cave as possible for an experience unlike any other. Schroer agrees. “A visit to Mammoth Cave is not complete without a cave tour,” she says.

Schroer cautions, “It is also important to reserve your tickets in advance through Recreation.gov, so you get the tour that you want, at the time you want, on the date you want,” she says. Tours change seasonally and often sell out weeks in advance.

Ranger Recommendation: Join a six-hour Wild Cave Tour, where you'll get to crawl and climb your way through a route chosen by your guide based on interests and abilities. Navigate features like the Bear Hole and the Birth Canal, named for their difficulty. Be sure to adhere to specific clothing and body measurement requirements to participate in this strenuous trek—and book in advance.

Things to do in Mammoth Cave National Park

Mammoth Cave stands out because of the range of activities available, according to Ribes. Hiking on the surface and through the cave are the main draws for most visitors to Mammoth Cave National Park for most visitors, but there is much more to do.  

The Green River Ferry, which began operating in 1934, carries visitors, bicycles, and vehicles across the Green River. Seasonally, visitors can canoe or kayak from various access points along the rivers. Fishing without a license is also permitted within the park’s boundaries. The park also has over 60 miles of backcountry horseback riding trails, which vary in length and difficulty. Additionally, the park has approximately 20 miles (32.2 km) of trails for visitors to explore on mountain bikes or e-bikes. 

Volunteering to help with trail building, cave restoration, or mapping newly discovered or unexplored parts of Mammoth Cave in conjunction with the CRF is a unique way to experience the park. 

At night, stargazing in the International Dark Sky Park is a popular nighttime activity. Join a ranger-led evening program or gaze up to see stars with the naked eye.

Best things to do for families

Schroer recommends that families paddle along a portion of the Green and Nolin Rivers Blueway National Water Trail (36 miles/57.9 km) because it “offers the opportunity to see the sunny side of the park from the seat of a canoe or kayak,” along with its abundant wildlife.

Ribes recommends the Green River Bluff, Echo River Springs, Sinkhole, and Heritage Trail (4.6 miles/7.4 km) combination route for families. It’s “a great, kid-friendly trail that takes you through the beautiful forest and along the river,” he says. 

Several cave tours are family-friendly. Children often enjoy the Frozen Niagara (0.25 miles/0.4 km) and the Domes and Dripstones tours (0.75 miles/1.2 km). Adventurous families can crawl through caves and go off-trail on the family-only Trog Tour (1 mile/1.6 km).

Children can also become Junior Rangers by completing a free activity book and getting sworn in by a ranger at the visitor center.  

Where to stay

Mammoth Cave National Park has three front-country campgrounds with basic amenities, including showers and laundry machines. There are also 13 backcountry campsites that take hours to reach via hiking, canoeing, or horseback riding. Permits are needed for all campsites, and reservations are highly recommended.

Inside the park, visitors can stay at the Lodge at Mammoth Cave, which has a mix of hotel rooms and historic cottages to meet a variety of needs and budgets. Outside of the park, head to nearby Cave City, Kentucky, to stay in a traditional teepee at Historic Wigwam Village No. 2, approximately 15 minutes from the park. Bowling Green, Kentucky, approximately 35 minutes away, has a wider variety of accommodations, including SpringHill Suites by Marriott, Bowling Green.

What else you should know

Entrance Fees: There is no fee to enter the park or hike on surface trails. However, all visitors to the cave must register for a tour and pay a fee, ranging from $12.00 to $79.00 for adults. 

Entrances: There is only one formal entrance to the park, on the park’s south side at the visitor center. GPS may be unreliable for navigating to the park. 

Visitor Center: The Mammoth Cave National Park Visitor Center is located near the cave’s Historic Entrance on the south side of the park. 

Are pets allowed: Leashed pets are allowed on surface hiking trails and campgrounds.

How accessible is the park?

“Mammoth Cave is one of the most wheelchair-accessible national parks in the country, both above and below ground,” Ribes says.

The park offers a dedicated two-hour Accessible Tour (0.5 miles/0.8 km). There are four officially recognized accessible trails within the park: Echo River Spring Trail (1 mile/1.6 km), Sand Cave Trail (.0.3 miles/0.48 km), Sloans Crossing Pond Trail 0.4 miles/0.64 km), and Heritage Trail (0.6 miles/.97 km). There is also an accessible picnic area, restrooms, and on-site cabins.