Kaumana Caves
Explore lava tubes and caves.
Directions Maps, and Info
Overview
Kaumana Caves is a massive lava tube located just outside Hilo, offering visitors the chance to explore an underground world formed by a Mauna Loa eruption in 1881. Unlike the more developed Thurston Lava Tube in Hawai‘i Volcanoes National Park, Kaumana Caves is rugged, unlit, and truly feels like an adventure.
The entrance to the cave is a collapsed skylight, revealing a lush, fern-filled opening that leads into the dark lava tunnels. Exploring the caves requires caution, a flashlight, and sturdy shoes, but the experience is unforgettable.
Highlights
🌋 Lava Tube Exploration
🥾 Hiking & Adventure
🌿 Lush Scenery
🕵️♂️ Off-the-Beaten-Path
🚶♂️ Short Walk Required
Parking and Access
A small parking area is located directly across from the cave entrance on Kaumana Drive. The lot is limited, but roadside parking is sometimes available.
A steep metal staircase leads down into the cave entrance. The rocks can be slippery, especially after rain, so use caution while descending.
Key Details
Best Time to Visit: Morning or early afternoon for better visibility and fewer crowds
Duration: 30 minutes to 2 hours, depending on how far you explore
Suitable For: Adventurous travelers, hikers, and geology enthusiasts
Cost: Free
What to Bring
Flashlight or headlamp – The caves are completely dark, and phone flashlights are not enough.
Sturdy shoes – The lava rock is sharp and uneven. Avoid flip-flops.
Helmet or hat – Low ceilings and sharp rock formations make head protection a good idea.
Gloves – Some areas require scrambling over rocks.
Jacket – The cave can feel cool and damp inside.
Water – No facilities are available nearby.
What to Expect
Two Separate Lava Tubes
The cave splits into two main tunnels—one heading deeper into the lava tube system and the other staying closer to the entrance.
Rugged, Unlit Terrain
Unlike Thurston Lava Tube, Kaumana Caves is undeveloped, meaning there are no lights, railings, or paved walkways. This makes for a raw and exciting adventure.
Lush Entrance
The cave entrance is surrounded by vibrant ferns and moss, creating a beautiful contrast with the dark lava rock.
Slippery and Uneven Surfaces
The cave floor consists of loose rocks, uneven ground, and damp areas. Exploring requires careful footing.
Limited Exploration Distance
The lava tube extends for miles but eventually becomes too rough for most visitors. It’s best to explore only as far as you feel comfortable.
Tips & Info
Bring a strong flashlight
A dim phone flashlight is not enough to safely navigate the cave.
Watch your head
Lava formations hang low in some areas, so move carefully.
Explore with a buddy
The cave is dark and rugged, making it safer to explore with a friend.
Check for rain before visiting
Heavy rain can cause slippery conditions inside the cave.
Respect the cave
Do not remove rocks or disturb any natural formations.
Bottom Line
Kaumana Caves is a must-visit for adventurous travelers looking to explore a raw and undeveloped lava tube. With no artificial lighting or paved paths, this cave offers a true underground adventure just minutes from Hilo. Bring a flashlight, wear sturdy shoes, and be prepared for an unforgettable experience.