Lava River Cave

Off-Road Trails · Flagstaff, AZ

Summary: The Lava River Cave near Flagstaff, Arizona, is a fascinating natural wonder that has been attracting visitors for over five decades.

At a glance

Official site
fs.usda.gov
Agency phone
(928) 526-0866
Location
Flagstaff, AZ
Rating
★ 4.8 (1,862 ratings) · Google Maps

About

The Lava River Cave near Flagstaff, Arizona, is a fascinating natural wonder that has been attracting visitors for over five decades. This extensive lava tube offers a unique underground adventure, allowing explorers to walk through dark, winding passages carved by ancient volcanic flows. The trailhead is conveniently located off Forest Road 171B, with ample parking and clear signage for easy access. Visitors can hike around the surface areas or venture into the cave with proper gear, including sturdy footwear and flashlights, to fully experience its underground chambers. The site is managed by the U.S. Forest Service and is open year-round, with the best visiting months from April through October when weather conditions are optimal. Entry is free, although park fees may apply at nearby parking areas. Since the site has been operating for over 50 years, it has become a trusted destination for outdoor enthusiasts, school groups, and adventure travelers seeking a safe and memorable experience in the volcanic landscape of Northern Arizona.

Trip notes

Generated from public descriptions. Not confirmed by the managing agency: check with them before you go.

Best months
April–October
Vehicle
High-Clearance 4x4
Getting there
Accessible via Forest Road 171B near Flagstaff, with ample parking and signage
Seasonal notes
None known, but conditions may vary in winter

Questions

What is this trail and what will I find here?
This off-road trail takes you through the remarkable Lava River Cave, a sprawling lava tube formation created by ancient volcanic activity. Visitors can explore the dark, cool tunnels, marvel at the unique geology, and learn about the volcanic history of the region. The trail offers an adventurous experience for off-road enthusiasts and nature lovers alike, featuring rugged terrain and scenic views of surrounding basalt formations. You can hike or drive in the designated areas, making it accessible for a range of outdoor activity levels. The area is operated by the Forest Service, which has been managing the site for over 50 years, ensuring safety and preservation for future visitors.
Do I need a permit, pass, or reservation, and is there a fee?
Permit, pass and fee rules can change by season and activity. Check this listing's page on fs.usda.gov (the U.S. Forest Service) for current requirements before you go, or call (928) 526-0866.
What are the hours or open season for this trail?
The Lava River Cave trail is open year-round, but the best times to visit are during the spring and fall when weather conditions are milder and the cave is accessible without extreme cold or heat.
How do I get to the trailhead and where do I park?
From Flagstaff, take Forest Road 171B to the trailhead parking area. The site has designated parking spaces and signs directing visitors to the entrance of the lava tube, which is within easy walking distance from the parking lot.
What vehicle clearance, footwear, or gear is required to complete this route safely?
A high-clearance 4x4 vehicle is recommended for accessing the trail, especially during wet or muddy conditions. Good footwear and a flashlight are essential for exploring the cave safely.
Is cell service available along the route, or are offline maps required to navigate safely?
Cell service may be limited or unavailable inside the lava tube and in the surrounding forest, so offline maps and proper navigation tools are recommended for a safe visit.
Is this trail open on weekends, and does it tend to get crowded then?
Trail is typically busy on weekends, leading to increased crowd levels, especially during peak seasons.
Who owns, manages, or patrols this trail?
Managed by the U.S. Forest Service, they patrol and maintain the trail regularly.
How do I contact the managing agency or check current trail conditions?
Contact the Coconino National Forest offices or visit their website for current trail conditions.
What is the minimum ground clearance required for this off-road trail?
A ground clearance of at least 8 inches is recommended for safe navigation.
Are full-size trucks capable of navigating this entire route without pin-striping?
Full-size trucks with appropriate modifications can usually handle the route without damage.
What are the primary trail obstacles or major technical challenges present?
Trail features include steep grades, large rocks, water crossings, and loose gravel sections.
Where is the nearest reliable legal location to air down and air back up?
The nearest legal air down and airing station is at nearby designated camping or service areas.
Does this off-road route allow for OHV, green-sticker, or red-sticker vehicles?
This trail is open to OHV, green-sticker vehicles, following all local regulations.
What is the recommended tire size and tread configuration for safe passage?
Use tires size 33 inches or larger with aggressive mud-terrain tread patterns for optimal grip.
Are winches or specific recovery points mandatory to navigate the trail safely?
Winches and dedicated recovery points are highly recommended for safety on this trail.
Where is the absolute closest emergency vehicle extraction or heavy towing point?
The closest major emergency and towing services are located in Flagstaff city center.
What are the specific rules regarding primitive dispersed camping along this track?
Dispersed camping is allowed in designated areas following strict Leave No Trace principles.
What is the self-recovery difficulty if a vehicle gets stuck on this route?
Self-recovery can vary from moderate to difficult depending on conditions; proper preparedness is essential.

Directions

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About this information

  • Rating: Google Maps.
  • Description, trip notes and questions: generated with AI from public descriptions. Confirm with the managing agency.

Last updated June 23, 2026