Carlsbad Caverns National Park

Carlsbad Caverns National Park sits in the Guadalupe Mountains of southeastern New Mexico, about 25 miles southwest of the city of Carlsbad. The park covers 46,766 acres of Chihuahuan Desert surface and protects more than 119 caves beneath it, all formed through a rare sulfuric acid dissolution process rather than the more common rainwater-erosion process found in most cave systems. The main cave, Carlsbad Cavern, contains the Big Room — one of the largest cave chambers in North America, with a floor area of 8.2 acres and a ceiling 255 feet high at its tallest point. The park ranks 47th among the 63 U.S. national parks by annual visitation, drawing roughly 441,000 visitors in 2023. A colony of up to 400,000 Brazilian free-tailed bats roosts in the cave from late spring through fall and spirals out at dusk in a flight visible from a surface amphitheater at no additional charge.

The Big Room, a single cave chamber with 8.2 acres of floor space and formations including the 62-foot Giant Dome column, reachable by a 750-foot elevator ride or a 1.25-mile walk-in route through the Natural Entrance.
The nightly bat flight from late April through October, when up to 400,000 Brazilian free-tailed bats spiral out of the Natural Entrance at dusk in a counter-clockwise column that can last up to two hours and is visible from a free surface amphitheater.
Lechuguilla Cave, descending 1,604 feet to become the deepest cave in the United States, accessible only to permitted scientific researchers — the most extensive and pristine cave system in the country.
A formation inventory unlike any other American cave: stalactites, stalagmites, columns, soda straws, helictites, cave pearls, cave popcorn, and lily pads — all still growing slowly in the sections of the cave that hold moisture.

By car: The park entrance is on US Highway 62/180, about 25 miles southwest of Carlsbad, New Mexico, and 55 miles northeast of El Paso, Texas. From Carlsbad, drive south on US 62/180 to the park entrance at White's City, then continue 7 miles uphill on the park road to the visitor center. From El Paso, the drive is about 1.5 hours north on US 62/180.

By air: El Paso International Airport (ELP) is the nearest major airport, approximately 150 miles southwest. Rental cars are available at the airport. Midland International Air and Space Port (MAF) in Texas is about 150 miles northeast and also serves the region. No commercial air service operates closer to the park.

By shuttle: No public transit or shuttle service connects Carlsbad or El Paso to the park. A personal vehicle is the only practical way to reach the visitor center. Carlsbad, New Mexico, has gas stations, grocery stores, and restaurants for resupply before making the drive out to the park.

Carlsbad Caverns formed through a process called sulfuric acid speleogenesis, which is rare and fundamentally different from how most caves in the world form. In typical cave formation, rainwater absorbs carbon dioxide to form mild carbonic acid, which slowly dissolves limestone from the surface down. At Carlsbad, hydrogen sulfide gas rose upward from petroleum deposits deep below the Guadalupe Mountains, mixed with groundwater, and converted to sulfuric acid that dissolved the limestone from below. The result is caves with large, irregular chambers rather than the stream-carved passages typical of most cave systems.

The limestone the caves formed in is part of the Capitan Reef, a horseshoe-shaped fossil reef built by sponges, algae, and other marine organisms about 250 to 265 million years ago when a shallow sea covered what is now southeastern New Mexico and west Texas. The reef is exposed at the surface as the Guadalupe Mountains and is one of the best-preserved ancient reef complexes in the world.

The cave itself is ancient — it formed roughly 4 to 6 million years ago when the water table was much higher. As tectonic uplift raised the Guadalupe Mountains, the water table dropped and the caves drained and dried. The formations — stalactites, stalagmites, columns, soda straws, cave pearls, and helictites — began growing when slightly acidic water dripping through cracks in the rock deposited calcium carbonate. Formations still grow in wet sections of the cave today, at a rate of about one cubic inch every 200 years.

Lechuguilla Cave, discovered in its full extent in 1986, penetrates 1,604 feet below the surface and extends more than 145 miles of mapped passage, making it the deepest cave in the U.S. and one of the longest in the world. Its remote sections contain formations — cave bubbles, cave rafts, sulfur-coated speleothems — found nowhere else on Earth.

Brazilian free-tailed bats (Tadarida brasiliensis) are the park's defining wildlife. A colony of up to 400,000 bats roosts on the ceiling of Bat Cave, a section of Carlsbad Cavern below the Natural Entrance, from late April through October. Each evening at dusk the bats exit in a dense counter-clockwise spiral column that can take up to two hours to empty from the cave. The bats fly south into the Chihuahuan Desert and eat up to three tons of insects per night. In late October or early November, the colony departs for Mexico.

Cave swallows nest in large numbers at the Natural Entrance from spring through summer, sharing the opening with the bats. The swallows return each morning just before the bats, creating a brief interchange at the cave mouth at dawn.

Mule deer are the most visible above-ground mammals and are common throughout the park's desert terrain, particularly in drainage areas with shrubs and grasses. Porcupines, ringtail cats, raccoons, and striped skunks inhabit the rocky canyon areas. Mountain lions are present but rarely encountered. Peregrine falcons nest on the limestone escarpments; golden eagles are year-round overhead.

Reptiles are well-represented in the Chihuahuan Desert surface. Western diamondback rattlesnakes are present; watch carefully on and off trail. Collared lizards, whiptail lizards, and Texas horned lizards are all common on warm rock surfaces from April through September. Greater roadrunners appear on the park road and in open desert year-round.

Human presence in the Guadalupe Mountains extends back at least 10,000 years. Pictographs painted near the Natural Entrance — red and yellow ochre figures on the cave walls just inside the opening — are attributed to people of the Archaic period and remain visible today. Mescalero Apache people used the area for centuries before European contact and have cultural connections to the land that the NPS acknowledges in park management.

Anglo-American cowboys noticed the massive bat flights rising from the ground in the late 1800s. Jim White, a teenage ranch hand, descended into the cave around 1898 using a homemade wire-and-wood ladder and began to explore and name its rooms. He guided early visitors into the cave for years and spent decades advocating for its protection. Commercial guano mining began around 1903; millions of pounds of bat guano were removed and sold as fertilizer.

Recognition of the cave's significance grew slowly. President Calvin Coolidge proclaimed Carlsbad Cave National Monument on October 25, 1923. Survey work by NPS geologist Willis Lee confirmed the cave's scale and importance, and Congress established Carlsbad Caverns National Park on May 14, 1930. The park was named a UNESCO World Heritage Site in 1995 in recognition of the Lechuguilla Cave system and its scientific significance.