The underground world is fun to explore, especially when you get to bring your own flashlights and go at your own pace. That is the only option in most National Forests, with a few notable exceptions for guided tours found on this list. It was the opposite case when I ranked the Top 10 Caves in National Parks back in 2019 (click here to see all our Top 10 Lists).
If you or someone you love are interested in visiting the 155 National Forests, our travel guidebook Out in the Woods makes a great gift!

10. Subway Cave in Lassen National Forest (California)
There are interpretive signs inside this lava tube, including one explaining lavacicles
9. Fulford Cave in White River National Forest (Colorado)
This one and Spring Cave are only accessible April 16 through August 14 and require registration
8. Lava River Cave in Coconino National Forest (Arizona)
This is the first lava tube I ever explored while I was a college student in Flagstaff
7. Mammoth Cave in Dixie National Forest (Utah)
Ice Cave is another option to visit in southwest Utah
6. El Capitan Pit in Tongass National Forest (Alaska)
Prince of Wales Island is mostly karst and includes this deepest pit in the U.S., plus Sophia’s Sinking Stream Cave and Meow Cave
5. Cave of Bells in Coronado National Forest (Arizona)
This cave has a lock on its entry gate, as does Onyx Cave, but are accessible with permission
4. Boyden Cavern in Sequoia National Forest (California)
Guided tours are offered in this show cave outside Kings Canyon National Park

3. Ape Cave in Gifford Pinchot National Forest (Washington)
Timed-entry permits ($2 per vehicle) are required to explore this long lava tube in Mt. St. Helens National Volcanic Monument, but not for Guler Ice Caves
2. Blanchard Springs Caverns in Ozark National Forest (Arkansas)
Limestone springs and caves are all over this region, including this show cave with guided tours
…and finally the #1 cave in a National Forest:

1. Minnetonka Cave in Caribou National Forest (Idaho)
Tickets for a guided tour are required to drive up the narrow road to the parking lot, plus check out nearby Paris Ice Cave
.
Honorable Mentions
Jot Dean Ice Cave in Shasta National Forest (California)
I stumbled upon this one while visiting Sáttítla Highlands National Monument, also home to lava tubes in Giant Crater
Resurgence Cave in Daniel Boone National Forest (Kentucky)
All caves around here are currently closed to protect bats, including the ones behind Moonshiners Arch

Wind Cave in Cache National Forest (Utah)
Not very dark on this cliffside, but it is a great spot for photographs
Wave Cave in Tonto National Forest (Arizona)
Another one that is more of an amphitheater than a cave, but famous for photos riding the wave
Darby Canyon Wind Cave in Targhee National Forest (Wyoming)
I had not heard of this cave just west of Grand Teton National Park
Sandia Cave in Cibola National Forest (New Mexico)
Located near Albuquerque, it features a unique metal spiral staircase to the entrance

Know someone who loves the National Forests? Gift them our travel guidebook Out in the Woods so they can learn more about all 155 National Forests.
































































































