Lava River Cave

Lava River Cave Flagstaff Travel Guide

The Lava River Cave, also known as Lava Tube, is a fascinating underground wonder located just outside Flagstaff, Arizona. Formed approximately 700,000 years ago by a volcanic eruption from nearby Hart Prairie, this mile-long lava tube offers visitors a rare chance to hike through a dark, ancient corridor once filled with flowing molten rock. It’s one of the most unique natural attractions in northern Arizona and a popular spot for adventurous hikers, geology enthusiasts, and curious travelers alike.

Highlights of Lava River Cave Flagstaff

• Ancient Lava Tube: Walk through a vast volcanic tunnel up to 30 feet wide and 50 feet high, created when the outer layer of lava hardened while the inner flow continued, leaving a hollow tube behind.
• Complete Darkness: There’s no artificial lighting inside, making it a thrilling experience. You’ll need to bring your own light source and navigate through the cool, dark passage.
• Volcanic Features: Look for fascinating rock formations such as lavacicles (lava stalactites), flow lines, and benches created by fluctuating lava levels.
• Natural Air Conditioning: Temperatures inside the cave stay cool year-round—around 40°F (4°C)—even during Arizona’s hot summers.

Best Time to Visit Lava River Cave Flagstaff

The cave is open to the public year-round, but the best time to visit is from late spring to early fall (May to October) when forest roads are most accessible. Winter visits are possible but can be risky due to snow and icy conditions, which make both the roads and the cave floor hazardous.

Getting to Lava River Cave Flagstaff

The Lava River Cave is located about 14 miles northwest of Flagstaff in the Coconino National Forest.

• By Car: From Flagstaff, take US-180 N for about 9 miles, then turn left on Forest Road 245. Follow signs for the Lava River Cave, continuing on Forest Road 171 and then Forest Road 171B. The last few miles are unpaved, and a high-clearance vehicle is recommended in wet conditions.
• Parking: A small parking lot is available at the trailhead. No facilities are present, so come prepared.

Ticket Information for Lava River Cave Flagstaff

• Entrance Fee: Free—no permits or reservations are required to visit the cave.
• Hours: Open daily from dawn to dusk. Camping is not allowed at the cave site.
• Restrooms: None available on-site. The nearest restroom is at the turnoff to FR 171.

Tips for Visiting Lava River Cave Flagstaff

• Bring Multiple Light Sources: A strong flashlight or headlamp is essential, and a backup light is highly recommended in case of battery failure.
• Dress for the Cold: The cave is always cold, even in summer. Wear layers, gloves, and a hat to stay warm.
• Wear Sturdy Shoes: The cave floor is rocky and uneven. Hiking boots with good ankle support are ideal.
• Watch Your Step: The entrance is steep and can be slippery. Take your time and move carefully through the cave.
• Leave No Trace: Carry out everything you bring in. Help preserve the cave for future explorers.

Nearby Attractions

• Arizona Snowbowl: A popular ski resort in winter and hiking destination in summer, offering stunning views of the San Francisco Peaks.
• Lowell Observatory: A historic observatory in Flagstaff where Pluto was discovered.
• Walnut Canyon National Monument: A fascinating site featuring ancient cliff dwellings just east of Flagstaff.

Final Thoughts on Visiting Lava River Cave Flagstaff

Lava River Cave offers a truly unique experience in Arizona—a rare chance to walk through the cooled veins of an ancient volcano. With its eerie silence, chilly air, and surreal rock formations, the cave provides a thrilling contrast to the sun-drenched landscapes above. It’s the perfect stop for nature lovers, weekend warriors, or anyone looking to add a little subterranean adventure to their Arizona road trip. Just remember to come prepared—and don’t forget your flashlight!