Lava River Cave: A Subterranean Journey Through Volcanic History

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Explore a 700,000-year-old lava tube near Flagstaff, Arizona, with constant cool temperatures, unique geological formations, and a thrilling subterranean adventure.

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Coconino County
Lava River Cave

Descend into the depths of the Lava River Cave, a 700,000-year-old lava tube near Flagstaff, Arizona. Explore this unique geological wonder formed by molten rock, where the temperature remains a constant cool 35-45°F, even in summer. Remember to bring multiple light sources and warm clothing for your adventure!

A brief summary to Lava River Cave

171B Forest Rd, Flagstaff, Arizona, 86001, US
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Monday 12 am-12 am
Tuesday 12 am-12 am
Wednesday 12 am-12 am
Thursday 12 am-12 am
Friday 12 am-12 am
Saturday 12 am-12 am
Sunday 12 am-12 am

Local tips

Wear sturdy hiking boots or closed-toe shoes with good traction due to the uneven and slippery cave floor.
Bring at least two reliable light sources per person, such as headlamps or flashlights, as the cave is completely dark.
Dress warmly in layers, as the cave temperature remains between 35° and 45°F (2° and 7°C) year-round.
Consider wearing a helmet to protect your head from low ceilings and uneven surfaces within the cave.
Check road conditions and access to the cave, especially during winter, as Forest Roads 245 and 171 may be closed due to snow or mud.

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Getting There

Driving

To reach the Lava River Cave from Flagstaff, begin by heading north on US-180 for approximately 9 miles. Turn west (left) onto Forest Road 245 (FR 245) at milepost 230. Continue for 3 miles to Forest Road 171 (FR 171) and turn south (left). Drive 1 mile to Forest Road 171B (FR 171B) and turn left. Follow FR 171B a short distance to the Lava River Cave parking area. The final section of the route is on unpaved roads, so a high-clearance vehicle is recommended, especially in wet conditions. The drive takes approximately 45 minutes. Parking is free at the trailhead parking lot. Taxi services like Apex Taxi, Gypsy Cab, and Hurry Cab, as well as rideshare options such as Uber and Lyft, are available in Flagstaff. A taxi ride to the cave would cost an estimated $35-$50.

Discover more about Lava River Cave

The Lava River Cave, also known as Lava Tube, is a remarkable geological site located approximately 14 miles northwest of Flagstaff, Arizona, within the Coconino National Forest. This unique cave was formed around 700,000 years ago by a volcanic eruption in the nearby Hart Prairie. During the eruption, lava flowed from a volcanic vent, and the outer layers hardened, creating a tube-like structure while molten lava continued to flow inside. Once the eruption ceased, the remaining lava cooled, leaving behind a fascinating 3/4 mile-long tunnel.Lumbermen discovered the cave entrance in 1915. The cave's consistently cool temperatures, ranging from 35° to 45°F (2° to 7°C) year-round, led early settlers to use it as a natural refrigerator, harvesting ice from the entrance. Today, the Lava River Cave offers an adventurous experience for hikers, geology enthusiasts, and anyone seeking a unique natural attraction.Inside the cave, you'll find a dark and fascinating world. The cave floor features ripple marks and splashdowns, which serve as evidence of the ancient lava flow. The entrance requires some scrambling over loose, slippery rocks, and the cave's ceiling height varies, sometimes requiring crouching or crawling. Be sure to bring sturdy shoes, warm clothing, and multiple sources of light.The cave is generally open year-round, but access may be limited during winter due to road closures. Despite the road conditions, the cave remains a popular destination, offering a glimpse into the region's volcanic past.