Mammoth Cave National Park

Mammoth Cave National Park protects 52,830 acres of south-central Kentucky and the cave beneath them: 426 miles of surveyed passage, the world's longest known cave system in the Park Service's words. The park had 660,734 recreation visits in 2025, and no visitor goes underground without a tour ticket.

The park was established on 1 July 1941 and listed as a UNESCO World Heritage Site on 27 October 1981. We checked the figures below on 27 October 2026 on the park's own pages and alerts, Recreation.gov, the lodge operator's site, the federal time-zone rules and NOAA's normals.

Why can't you enter Mammoth Cave without a tour ticket?

Mammoth Cave can be entered only on a tour, and every tour needs a ticket: "To go into the cave, you must purchase a tour ticket," the park says. Entry to the park and its surface features is free. Tours, camping and shelters are what cost money.

The park is not one of the eleven parks with a $100 surcharge for non-residents in 2026. It accepts cash, all major cards, Apple Pay and Google Pay, and checks.

The $250 non-resident America the Beautiful pass gives nothing here. Only the Senior and Access passes count, for half price on tour tickets for the cardholder, and that discount is sold at the visitor center rather than online. Our guide to national park fees for international visitors explains when the pass is worth buying.

Tickets are sold on Recreation.gov or by phone on (877) 444-6777, from 9 a.m. to 9 p.m. Central. Sales open 180 days ahead and close online an hour before a tour, though the park may publish a schedule only one to three months ahead. Arrive at least 30 minutes early to collect paper tickets; latecomers forfeit the fee. Any change counts as a cancellation, at $1 a ticket, with no refund inside 24 hours.

Under-16s must be with an adult aged 18 or over. The year's last fee-free day, 11 November, applies only to US residents, and the park says either Mammoth Passage or the Discovery Tour may be offered then.

Which tour suits a first visit to Mammoth Cave?

The Historic Tour suits most first visits to Mammoth Cave: two hours and 2 miles through huge rooms and tight places. Frozen Niagara, at a quarter of a mile and 64 stairs, is the park's suggestion for anyone who has difficulty walking long distances. The prices below are for adults aged 13 and over.

Prices come from the park's fees page and the other details from its tour page. Children aged 6 to 12 pay less, $18 on the Historic Tour, and several tours take no one under 6. Domes and Dripstones descends 280 stairs at the start and ends at Frozen Niagara. Grand Avenue is "a lengthy, half-day hike inside of the cave", in the park's words.

The Wild Cave Tour crawls off the trails, and anyone whose chest or hips measure more than 42 inches round cannot take it. Lace-up ankle boots with slip-resistant soles are required, and the park supplies all the other gear.

The Accessible Tour, $27, goes down by elevator with no stairs. On 27 October 2026 the park's alert said the elevator had been out of service since 6 May 2026, so the tour was not running.

Which tours run from late November to February?

Mammoth Cave runs five tours a day from 29 November 2026 to 28 February 2027, the last date the park has published. Tours run every day of the year except 25 December. Several tours appear on no date up to 28 February, and Recreation.gov had released no tours at all for March, April or May 2027.

The Wild Cave Tour, Introduction to Caving, the Trog Tour for children, River Styx, Star Chamber, Cleaveland Avenue and the Accessible Tour are not scheduled on any date up to 28 February 2027. The Historic Tour drops out from 15 November. All times are Central.

In winter the park says tickets are "generally still available days in advance". Mammoth Cave Campground closes after 30 November, and the Lodge reduces its services and rooms.

When do Grand Avenue, Violet City and the other tours sell out?

Mammoth Cave's tours sell out mostly in summer and on busy autumn weekends. In August 2026 the Wild Cave Tour had no tickets left on 10 of its 13 days, Violet City on 11 of 21 and Grand Avenue on 12 of 31. The Historic Tour sold out on no more than two days in any month from August to October.

On Saturday 24 October 2026, Frozen Niagara, Gothic Avenue, Grand Avenue, Great Onyx and Violet City all sold out. As of 27 October, Violet City was sold out on 31 October, 1, 7, 11 and 14 November. Grand Avenue was sold out on 21 and 27 November, Great Onyx on 22 and 27 November, and Broadway on 19 December. Every other tour-day to 28 February 2027 still showed tickets.

The park warns that autumn tickets often sell out on holidays and during local schools' fall breaks. Recreation.gov adds that school groups crowd the cave in March, April and May. In 2025, March brought 74,221 visits, more than April or May.

How do you reach Mammoth Cave from Louisville or Nashville?

Mammoth Cave is reached by car from I-65: exit 53 at Cave City from the north, or exit 48 at Park City from the south. The park says there is no public transport near it, and taxis and rideshares rarely come. Arrange a pick-up before you are dropped off.

The distances are our own routing without traffic or the clock change. The park's own figures are 89 miles from Louisville's airport and 99 from the airport at Nashville, both with car hire. Its FAQ gives 80 and 90 minutes, shorter than our routing.

The park warns: "DON'T TRUST YOUR VEHICLE NAVIGATION SYSTEM / GPS", since apps can route drivers over the river ferry or narrow roads. There is no fuel station and no electric car charger in the park. Fill up in Cave City, Park City or Brownsville. Only Verizon phones typically get a signal, and the visitor center and Lodge have free Wi-Fi.

Why is the cave an hour behind Louisville?

Mammoth Cave is on Central Time, and Louisville, 93 road miles away, is on Eastern. "Mammoth Cave is on Central Time," the park's FAQ says, and drivers from the north cross from Eastern Time at the northern Hart County line. Every tour time on Recreation.gov is Central.

A 9:15 Grand Avenue start is therefore 10:15 by a Louisville clock. Nashville, in Tennessee, shares the park's time. Lincoln's birthplace, 45 miles away by road, is back on Eastern.

Daylight saving time ended at 2 a.m. on 1 November 2026, and the park is at UTC−6 until 14 March 2027. The park's FAQ prints GMT−5, which is the summer offset only.

Why must you walk across a white-nose syndrome mat after a tour?

Every visitor on a Mammoth Cave tour must walk across bio-security mats at the end, "No exceptions", to slow the spread of white-nose syndrome. The bat disease was first detected in the cave in 2012, and some bat species have since seen mortality of over 90%.

The park has 13 confirmed bat species. The Indiana bat and gray bat are endangered, and the northern long-eared bat is threatened. On the crawling tours the park supplies coveralls, helmets, knee pads and lamps, and no personal caving gear is allowed. Bring spare shoes or sandals to wear while your boots are cleaned.

The deep cave stays at 54°F (12°C) all year, and near the entrances it varies, especially in winter. The park suggests a light jacket or sweater and good walking shoes. Flash photography, strollers, child backpack carriers, tripods, walking sticks other than canes, large backpacks and pets are not allowed on tours. The Lodge runs day kennels for $5 plus tax.

Who needs the Green River Ferry, and what if it stops?

The Green River Ferry matters only to visitors heading for the north side of the park, to Maple Springs and the backcountry trailheads. The visitor center, the cave tours and the Lodge are all on the south side. On 27 October 2026 the park's alert said the ferry had "temporarily suspended operation due to low water levels", with no reopening date.

The park has no bridge between its two sides. With the ferry stopped, the nearest crossing is on Highway 70 through Brownsville, a detour of about 45 minutes by Recreation.gov's figure. Updates come from the hotline on (270) 758-2166.

The ferry had reopened only on 5 March 2026. A flood in April 2025, when the river crested at 59.54 feet, damaged its navigational cables and towers. Recreation.gov says it takes up to two cars at a time, and it is the last active river ferry in the park.

Which trails are open above the cave, south and north of the Green River?

Mammoth Cave has over 80 miles of trails: 18 on the south side, around the visitor center, and over 60 in the backcountry north of the river. On 27 October 2026 the park's alert said the Old Guides, Heritage and Sunset Point trails and parts of the Sinkhole Trail were closed for rehabilitation. A January 2025 release had expected the Heritage Trail work to end in September 2025.

The lengths are the park's own. Summer is tick season, in the park's words.

The Green and Nolin rivers give over 30 miles of paddling inside the park. The classic trip runs 7.6 miles from Dennison Ferry to the Green River Ferry, in 2.5 to 4 hours. River use is banned when the park gauge reads 20 feet or more, and children aged 12 and under must wear a life jacket; everyone should. Two outfitters, Green River Canoeing and Mammoth Cave Canoe and Kayak, hold permits.

Where can you sleep inside Mammoth Cave National Park?

The Lodge at Mammoth Cave, next to the visitor center, has hotel rooms, cottages and family cabins that opened in August 2025. Its site prints no room prices. Woodland Cottages are usually open from 1 April to 1 November, and check-in is from 3 p.m. Other lodging is a 20 to 45 minute drive away, the park says.

Stays are limited to 14 nights at Mammoth Cave Campground and Maple Springs. From 1 December to 28 February only Houchin Ferry stays open. No firewood may be brought in, because of an emerald ash borer quarantine.

When does the surface above the 54°F cave pass 90°F?

The surface at Mammoth Cave reaches 90°F or more on about 54 days a year at NOAA's Mammoth Cave station, mostly in July and August. Underground it stays at 54°F. July was also the park's busiest month in 2025, with 102,778 visits, and January the quietest, with 16,250.

The table gives NOAA's 1991 to 2020 average highs and lows. The Mammoth Cave station gets 53.49 inches of rain a year, most in May and least in October. A second NOAA station inside the park reads cooler, with a July high of 85.5°F and 20 days a year at 90°F. The park calls autumn the driest season, with colour usually starting in late October.

October 2025 counted only 12,646 visits, against 75,732 in October 2024, and no park page we read explains the drop. It is no guide to a normal October.

Mammoth Cave is one of three National Park Service sites in Kentucky, none of which charges an entrance fee. Our state guide covers Cumberland Gap, the Bourbon Trail and the Derby.