Arizona is known all over the world for its impressive landscapes, including deserts, canyons, and unique rock formations. One of the best things to do in Arizona is the Lava Tubes just outside of the city of Flagstaff. In an area that is surrounded by snow-capped mountains and lush forests, the thought of finding lava-forged tunnels beneath the surface of the earth might sound strange, but that's exactly what makes this little wonder one of Arizona's most special and impressive sites to visit.
I still remember the first time I found the Lava Tubes—also called the Lava River Caves—tucked away in Arizona’s Coconino National Forest. You’ll find the entrance just about 14 miles outside Flagstaff, which means you can get there in under half an hour. If you’re already in town, there’s really no excuse not to make the drive.
Since they’re managed by the Forest Service, the Lava Tubes are open year-round—but I’ve learned not to count on access in the winter. I’ve run into muddy roads more than once after bad weather, and when that happens, you may need to hike or even ski to reach the cave. So if you're planning a visit during colder months, I suggest checking conditions first or being ready for a bit of a trek.
You won’t have trouble finding it, though. I’ve always taken Highway 180 north to mile marker 230, then turned left onto Forest Road 245. After a short drive, take another left on Forest Road 171, and before you know it, you’re in the parking lot, ready to descend into one of the most fascinating geological features I’ve ever explored.
The lava tubes themselves were formed about 700,000 years ago when molten lava carved out a path through solid rock. You don’t need a geology degree to appreciate it, though—I’ve seen kids, hikers, and scientists alike walk through in awe. You’ll probably feel the same. It’s less than a mile from end to end, and since it’s a straight shot with no side tunnels, you don’t have to worry about getting lost inside.
Every time I go, I spot new details in the lava rock—twists, ripples, even formations that look like frozen waves. If you love nature, geology, or even just a good adventure, you’ll be glad you came. I’ve brought my family a few times too, and it’s always been a hit. It’s not a difficult hike, but I’d still say wear something sturdy and watch your footing.
Now here’s something you really need to know: the lava tubes are completely unstaffed. I’ve never had to pay or reserve anything—just walk right in. But that also means you’re on your own when it comes to safety. I always bring at least two or three light sources: a headlamp, a flashlight, and even a glow stick or two. Trust me—you do not want to be inside when your only flashlight dies.
And those floors? Slippery and uneven. I’ve seen people in sneakers wipe out within five minutes. So do yourself a favor and wear proper hiking boots with good grip. You’ll feel a lot more secure navigating through the dark.
One thing that always catches first-timers off guard is the cold. No matter what time of year it is outside, it stays between 35 and 45°F inside the cave. I learned quickly to bring layers—even in July. If you show up in shorts and a T-shirt, you’ll wish you had a jacket once you’re a few steps inside. And if it’s rained or snowed recently, the cave gets damp too, so plan for that when you pack your gear.
I’ll leave you with one final piece of advice: please treat the lava tubes with care. I’ve sadly seen graffiti and trash there, and it’s heartbreaking. If you visit, help keep it clean and beautiful so others can enjoy the same sense of wonder I’ve felt every time I’ve stepped inside.
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