Explore These 9 Idaho Lava Tube Caves Your Family Will Be Talking About For Years

Millions of years ago, rivers of molten rock carved hollow tunnels beneath what is now Idaho, and those tunnels are still down there waiting. Some hold ice that never melts, even in July.

Others hide graffiti dating back to the 1800s or artifacts from people who sheltered underground long before highways existed. Grab a jacket, sturdy shoes, and a good flashlight, because these nine caves turn an ordinary weekend into a story your family will keep telling.

1. 17 Mile Cave Lava Tube In Idaho Falls

Flashlight beams bouncing off a smooth, art-covered floor set this Snake River Plain tube apart from the rest. Free to enter and open around the clock, it rewards anyone willing to bring several bright lights and full batteries.

The graffiti and painted art here are part of the draw, not a nuisance, giving each visit a scavenger-hunt feel as beams sweep across the passages. Huge caverns open up along the way, and in winter the frozen ceiling glitters overhead like scattered glass.

Come cold months, you may need to slide in through the entrance, and climbing back out is the toughest part of the whole trip. The rest plays out like a relaxed underground walk, roomy enough for kids to explore without feeling boxed in.

Because it sits close to Idaho Falls rather than out on a remote road, you can often have the place entirely to yourselves. Pack a jacket, wear shoes with grip, and carry backup lights.

It isn’t a marquee destination, but as a local cave stop it delivers big underground rooms and plenty of surprises. Find it in Idaho Falls, 83402.

2. Niter Ice Cave In Grace

Step a few feet down and the temperature drops so suddenly you’ll understand why this southeast Idaho tube earns its name. The change from warm surface air to the chilled interior is one of the most memorable moments of the whole outing.

Formed by a basalt flow long ago, the cave runs as a mostly straight lava tube that’s relatively easy to walk, with a gradual path leading down into the dark. The bottom can turn muddy or icy, so waterproof footing helps, and things tighten up toward the far end.

Graffiti covers stretches of the walls, some of it dating back to the late 1800s, which turns the markings into an accidental history lesson. The cave is genuinely fun for kids, and the easy access makes it a friendly introduction to caving.

Plan ahead with a warm coat and a strong flashlight, since there’s no lighting inside. A paid parking lot sits nearby, but there are no restrooms and no food, so handle those needs before you arrive.

Look for it on Ice Cave Road in Grace, 83241, off the beaten path in southeast Idaho.

3. Kuna Caves In Kuna

The adventure begins the moment you climb down a sturdy metal ladder through a caged shaft and drop into the quiet dark below. That descent alone makes this Treasure Valley tube a favorite with kids and teens looking for a real spelunking taste.

Down inside, the lava tube formations feel genuinely unique, and the underground setting reads as adventurous while staying accessible enough for beginners. Fine dust coats everything and kicks up as you move, so lights and a dust mask make the trip far more comfortable.

On a scorching southwestern Idaho afternoon, the cool underground air feels like a reward. Regular visitors return again and again for that reliable summer chill, treating it as a go-to escape from the heat.

Graffiti decorates the passages, adding a surreal, almost gallery-like atmosphere to the chilly depths. The route is short but memorable, threading through spots that range from open to snug.

Free parking sits right at the site, so there’s no fuss getting started. Bring bright lights, wear clothes you don’t mind dusting off, and you’re set.

You’ll find it on Kuna Cave Road in Kuna, 83634.

4. Idaho’s Mammoth Cave & Shoshone Bird Museum Of Natural History In Shoshone

A raised walkway and fenced path guide you through a massive lava tube where the air holds steady at a crisp 40 degrees. That self-guided setup along Highway 75 north of Shoshone means you set your own pace through one of the longest caverns in the region.

Sparkles catch the light along the walls, and different colored rocks add flashes of color to the primitive tube. The cave alone is worth the drive off the beaten path, but a modest fee also opens two on-site museums packed with taxidermy, fossils, and artifacts.

Between the underground walk and the two natural history collections, there’s plenty here to fill an afternoon and keep kids engaged. The experience earns its reputation over the nearby ice caves for sheer variety.

Restrooms are on hand, and both free and paid parking are available, so the practical details work in your favor. The place runs on a weekend schedule during its open season, so confirm before making the trip.

Bundle up for that chilly interior. You’ll find the complex at 251 West Thorn Creek Street in Shoshone, 83352, on Idaho’s Snake River Plain.

5. The Civil Defense Caves In St. Anthony

A long, bumpy drive is the price of admission here, and the payoff is a lava tube that seems to go on forever. Deep chambers and ice formations reward those who make the trek out near St. Anthony.

Down inside, the air stays cold enough that you can watch your breath fog even in late August, though whether you’ll want a jacket depends on your tolerance. Some in your group will be glad they packed a hoodie while others manage fine without one.

Graffiti marks the walls, and while it dulls the natural beauty a little, many find it doubles as handy reference points deep in the passages. The floor stays surprisingly clean of litter, better than you might expect for a spot this popular.

Kids do well here, since exploring doesn’t require anything too extreme, just good boots and reliable lights. The cave delivers that thrill of vast underground space without demanding advanced skills.

Heads up: the last mile of road turns rough, so a truck or higher-clearance vehicle makes the approach far easier. You’ll find these caves out near St. Anthony, 83445, in eastern Idaho.

6. Indian Tunnel In Arco

Called the coolest hole in the ground at Craters of the Moon, this cavernous tube is often the highlight of the whole monument. It sits along the volcanic lava flow fields near Arco, where the landscape looks more like another planet than Idaho.

An information board at the mouth lays out the route before you step in, which helps since the far end asks you to scramble over piles of rock to climb back into daylight. That built-in challenge turns a simple cave walk into a mini expedition kids love.

Because sections of the ceiling have collapsed over time, natural light filters into the massive chamber, so you’re not fully dependent on flashlights the way you are in darker tubes. The size of the space alone tends to leave families wide-eyed.

The monument stays busiest on certain evenings and mornings, so timing your visit for a quieter stretch means more room to explore. A free permit from the Visitor Center is required before entering any cave here.

Wear grippy shoes for the rock scramble. You’ll find Indian Tunnel within Craters of the Moon near Arco, 83213.

7. Dewdrop Cave In Butte City

Jagged rocks and a slightly tricky drop-in make this compact tube feel more hands-on than its neighbors at Craters of the Moon. It isn’t very deep, but getting down inside rewards anyone with a little athletic spirit.

Set among the national preserve’s lava fields near Butte City, the cave is one you explore on your own, picking your steps carefully as you go. The interior turns dark fast, so a flashlight isn’t optional here, it’s essential.

Despite its modest size, you can go relatively deep into the passage, which gives the experience a genuine sense of underground adventure without a long commitment. It works well as a shorter stop when you’re already touring the monument’s Caves Trail.

Watch your footing on the uneven rock, especially with younger explorers, since the terrain demands attention throughout. The payoff is a quieter, more intimate cave that many hikers overlook in favor of the bigger tunnels nearby.

As with every cave in the monument, grab a free permit at the Visitor Center before heading underground. You’ll find Dewdrop Cave inside Craters of the Moon National Monument and Preserve near Butte City, 83213, on Idaho’s stark volcanic plain.

8. St. Anthony Ice Caves In Island Park

Crawling flat on your stomach across ice is part of the deal at this tight, frosty tube, and the reward is worth every scraped elbow. A large ice curtain and glittering ceiling crystals wait for those willing to squeeze through.

The ice formations run stunningly deep into the cave, going a surprising distance back and turning the whole space into a shimmering, frozen world. It’s cold and wet throughout, so good gear separates a great trip from a shivering one.

Because the passages get genuinely tight, this adventure suits leaner explorers who don’t mind narrow squeezes. Waterproof grip gloves, a hat or helmet, and layers make the crawl through the chill far more bearable.

Water sometimes pools near the entrance and can look like flooding, though rocks above the surface let you pick a path deeper in, where everything quickly turns to solid ice. That transformation is half the fun.

Kids do well here with the right preparation, making it a memorable family climb through lava tube and ice combined. Bundle up, gear up, and expect to get a little wet.

You’ll find these ice caves near Island Park, 83429, in eastern Idaho.

9. Bear Trap Cave In American Falls

Refreshingly clean compared to some of its cousins, this pronounced lava tube skips the heavy garbage and graffiti and lets the natural rock take center stage. It’s the standout among several caves scattered across the American Falls area.

Cool air fills the interior year-round, which makes it a favorite for summertime spelunking when the surface bakes. Best of all, there’s no entrance fee, so you get a genuine underground adventure on a personal, unhurried scale.

Open around the clock, the cave invites exploration whenever you can get there, though the road out can turn very muddy in wetter months like February. A truck or higher-clearance vehicle earns its keep on the approach.

Wildlife occasionally shares the space, so keep an eye near the entrance where nesting birds sometimes set up shop and may limit how far you wander. It’s a small reminder that these are wild, living landscapes.

Pack a jacket for the chill and bring a flashlight, since the interior offers no light of its own. You’ll find Bear Trap Cave along the Minidoka to Arco Road near American Falls, 83211, out on Idaho’s wide Snake River Plain.