If you’re looking for a unique, otherworldly adventure in the Flagstaff area, the Lava River Cave is an absolute must-visit! Nestled in the Coconino National Forest, this mile-long lava tube invites explorers to descend into the cool, dark depths of a natural wonder formed over 700,000 years ago. My daughter Addy, my boyfriend Aaron, and I braved the cave this past August, and it was one of the most exciting and memorable experiences we’ve ever had. But before you grab your headlamp and head out, there’s a lot to know about this incredible destination.
What Is the Lava River Cave?
The Lava River Cave is a natural lava tube created by a volcanic eruption that occurred approximately 700,000 years ago. Molten lava flowed through the area, and as the outer edges cooled and hardened, the hot lava inside continued to flow, carving out the tube we see today. Stretching for about a mile underground, this cave is the longest lava tube in Arizona.
What makes this spot extra special is its unspoiled nature—no paved walkways, no artificial lighting, just raw, rugged beauty. As you journey through the cave, you’re walking in the footsteps of geological history, surrounded by sharp, jagged lava rock formations that remind you just how powerful nature can be.
Before You Go: Pack for the Cold
While August weather in Flagstaff is usually mild and sunny, don’t let that fool you when heading into the Lava River Cave. Once you step inside, temperatures plummet to a chilly 35-45°F, even in the height of summer. Trust me—you’ll feel it! I was so thankful we packed warm layers and a thermos of hot drinks. Here are a few essentials to bring:
- Layers: A warm jacket or fleece, gloves, and a hat are lifesavers.
- Flashlights or Headlamps: It’s pitch-black inside, and each person in your group should have their own light (and backup batteries).
- Sturdy Shoes: The rocky terrain inside is uneven and sharp in some spots.
- Snacks and Water: Fuel up for the journey, but be sure to pack out anything you bring in.
- Warm Drink: A hot coffee, tea, or cocoa was the perfect way to keep the chill at bay.
The Journey Inside
The adventure begins with a short hike from the parking area to the cave entrance, where you’ll descend into a jagged, rocky opening in the earth. Right from the start, you’ll feel the temperature shift as you step into the darkness.
Inside the cave, the path is a mix of scrambling over rocks and carefully navigating uneven surfaces. Some sections are wide and spacious, while others narrow down, forcing you to crouch or even crawl. There’s no official trail—just a single tube that winds its way deeper into the earth.
A Word of Caution: Watch your step! The lava rocks are sharp, and there are sections where you could easily slip or fall. Slow and steady is the name of the game here, and you’ll need to stay alert throughout the hike.
A Cave of Adventure
One of the coolest parts of the Lava River Cave is the sense of discovery at every turn. The walls are covered in fascinating textures, formed as the lava cooled and hardened in waves. The eerie quiet, broken only by the sounds of your footsteps and the occasional drip of water, adds to the mysterious vibe.
For the extra adventurous, the end of the cave holds a special surprise: a small hidey hole you can crawl into! Addy loved this part, and Aaron was brave enough to squeeze through, exploring even deeper into the cave’s recesses. It’s not for everyone, but it’s a fun option for those looking to go the extra mile (or, in this case, the extra crawl!).
How Long Does It Take?
The entire journey through the Lava River Cave, including the hike in and out, takes about 2-3 hours, depending on your pace. It’s not a race—take your time to enjoy the unique surroundings and watch your footing.
Tips for Visiting the Lava River Cave
- Timing Is Everything: Arrive early, especially during peak summer months, as the parking area can fill up quickly.
- Stay Safe: Wear gloves if you can—those sharp lava rocks can scrape hands and knees.
- Leave No Trace: Pack out all trash and respect the natural beauty of the cave.
- Keep It Fun for the Kids: Addy loved spotting unique rock formations and imagining what the lava must have looked like as it flowed through here.
A Cool Fact: Underground Star Show
One of the most amazing things about the Lava River Cave is its darkness. If you turn off your flashlights for a moment (safely, of course), you’ll experience total, absolute darkness—something that’s almost impossible to find in our modern, light-filled world. This makes the cave a favorite for astronomy buffs and photographers looking for a truly black backdrop.
Why You Should Visit the Lava River Cave
Exploring the Lava River Cave is more than just a hike—it’s an unforgettable journey into the earth’s geological history. From the thrill of scrambling over lava rocks to the awe of stepping into a world that feels untouched by time, this experience will leave you with a deeper appreciation for nature’s raw power and beauty.
Whether you’re a seasoned adventurer or just looking for a unique family outing, the Lava River Cave has something to offer. For us, it was a mix of adrenaline, curiosity, and quality time together that made it so special. Add it to your bucket list, and don’t forget to pack warm—Flagstaff’s coolest attraction (literally) is waiting to be explored!