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Hidden Gem

Kartchner Caverns State Park

2980 AZ-90, Benson, AZ

Benson, AZ

A living, dripping limestone cave still growing in the dark under the Whetstone Mountains, kept a close secret for fourteen years so it could be opened without harm.

Kartchner Caverns is one of the finest living cave systems in the country, a maze of wet limestone rooms hidden beneath a hillside in the Whetstone Mountains near Benson. Living means the cave is still forming: water still drips from the ceiling, formations still grow grain by grain, and the air inside stays cool and thick with moisture, a startling contrast to the dry desert overhead.

The cave's greatest wonder may be how it reached the public untouched. Two cavers found the entrance in 1974 and, understanding how fragile the place was, told almost no one for fourteen years while they worked out how to protect it. That secrecy is why Kartchner opened in modern times with its formations pristine, its mud floors unmarked, and its living systems intact, a rare thing among show caves.

What Guests Love

  • Towering, still-wet formations in a cave that is very much alive and growing
  • The Throne Room's great central column, one of the tallest formations of its kind
  • The remarkable story of how the cave was found and kept secret for years
  • A cool, damp, otherworldly break from the desert heat outside

Worth Knowing

  • Cave tours are guided and popular, so reserving well ahead is wise, especially in the busy season
  • To protect the cave, cameras and bags are not allowed inside, and misting keeps it humid
  • The cave stays cool and very humid year round, so a light layer helps
  • Parts of the cave close seasonally when bats use it as a nursery, so tours vary by time of year

Details

Address2980 AZ-90, Benson, AZ
Benson, AZ
Websiteazstateparks.comLink opens in a new tab.

Learn about Kartchner Caverns State Park

The secret in the hill

In November 1974 two young cavers, Gary Tenen and Randy Tufts, followed a faint sinkhole and a warm, damp draft of air into a crack in the Whetstone limestone and crawled through to find a vast, dripping cave that no one had entered before. They understood at once that footprints, broken formations, and even the oils on human skin could scar a cave like this forever, and they chose to keep it secret.

For fourteen years they told only a handful of trusted people, eventually including the Kartchner family who owned the ranch above it, all sworn to silence. When the group finally approached the state about protecting the cave, they did so quietly to avoid the vandalism that has ruined so many caves once word gets out. Arizona bought the land and spent years designing an entrance and tour system to keep the cave wet and alive, and it opened to visitors only after all that care was taken.

A cave that is still alive

Kartchner is a wet cave, and that is what sets it apart. Water seeping down through the limestone carries dissolved minerals, and drop by drop over long ages it builds the formations: stalactites hanging from the ceiling, stalagmites rising from the floor, thin soda straws, delicate draperies, and rare shapes with names like turnip shields and birdsnests. Because the cave was protected before human traffic could dry it out, these formations still glisten and still grow.

The showpiece is the Throne Room, home to a towering central column called Kubla Khan, one of the tallest cave columns in Arizona. To keep all of this alive, the park controls the humidity carefully, misting the air and using sealed doors so the desert cannot dry the cave, and it asks visitors not to touch the formations, since a single fingerprint can stop a growth that took thousands of years.

Bats, birds, and the world above

Each summer a colony of cave myotis bats returns to a section of Kartchner to give birth and raise their young in the warm, humid dark. To protect the mothers and pups, that part of the cave is closed to tours during the nursery season, so the experience shifts with the time of year. In the evenings the bats stream out to hunt insects over the desert, and their droppings feed the small living community inside the cave.

Above ground the park spreads across desert grassland and the lower slopes of the Whetstones, with mesquite, ocotillo, and hummingbirds at the feeders near the visitor center. Trails climb into the foothills, and the wide sky over this stretch of southeastern Arizona is dark and full of stars once the sun drops behind the mountains.

Season by season

The cave itself hardly changes, holding its cool, damp air steadily through the year, which makes it a welcome refuge on a scorching summer afternoon and a comfortable stop on a cold winter day. What changes with the seasons is the world outside and which parts of the cave are open.

Spring and fall are the gentlest times above ground, with mild days ideal for the foothill trails and the desert in bloom after rain. Summer brings the bat colony and the heat, so the cool cave is a relief and the evening bat flights are a draw, while summer storms can green the grassland. Winter days are crisp and clear, the crowds thinner, and the mountain air sharp under a wide, bright sky.

Closest Boutels

The closest Boutel™ stays, so you can turn this stop into an overnight. Each is an independently owned, editorially selected place to stay.

Jonquil Motel

Boutel

317 Tombstone Canyon Road, Bisbee, AZ

(520) 432-7371

37 miles away|Learn More ›

The Kennedy Hotel Tucson

Boutel

810 E Benson Hwy, Tucson, AZ

(520) 355-8900

43 miles away|Learn More ›

Hotel McCoy

Boutel

720 W. Silverlake Road, Tucson, AZ

(844) 782-9622

45 miles away|Learn More ›

Things to Do Near Benson

Benson

About 9 miles, a 15 minute drive

A small railroad town on the San Pedro River, an easy base with local diners and a stop on the old Southern Pacific line.

Tombstone

About 30 miles, a 40 minute drive

The famous silver-boom town of the O.K. Corral, its wooden boardwalks and old saloons preserved as a living piece of the frontier West.

San Pedro Riparian Area

About 25 miles

A ribbon of green cottonwood forest along the San Pedro River, one of the great birding corridors of the Southwest.

Tucson

About 45 miles, a 55 minute drive

The largest city of southern Arizona, ringed by saguaro forests and sky-island mountains, with museums, gardens, and a deep Mexican-American food tradition.