Mauna Kea Adz Quarry loop from Mauna Kea Visitor Parking

The Mauna Kea Adz Quarry loop from Mauna Kea Visitor Parking is one of those truly unique hiking routes that blends extreme natural beauty with profound historical significance. This difficult 7.2-mile (11.5 km) hike, with a substantial 3105 feet (946 metres) of elevation gain, typically takes around 4 hours and 42 minutes to complete. It's a demanding journey best suited for experienced hikers with excellent fitness, offering a rare glimpse into ancient Hawaiian culture amidst a lunar-like landscape.

What to expect on Mauna Kea Adz Quarry loop from Mauna Kea Visitor Parking

As you embark on this high-altitude adventure, the terrain quickly transitions from arid, volcanic slopes to a stark, lunar appearance once you pass the tree line. You'll navigate sandy stretches that give way to more stable rock, all while gaining significant elevation. The highlight of the route is undoubtedly the Mauna Kea Adz Quarry, a registered National Historic Landmark where ancient Hawaiians once harvested dense basalt for tools. On clear days, the views are spectacular, often placing you above the clouds with panoramic vistas stretching across the island, from Hilo to Mauna Loa. This trail is physically demanding due to the sustained ascent and high altitude, so be prepared for the effects of reduced oxygen.

Planning your visit

Given the challenging nature and high altitude of this hike, proper preparation is crucial. The Mauna Kea Visitor Information Station (VIS), located at 9,200 feet (2,804 meters), is an essential stop for acclimatization and gathering information before you head higher. Sturdy shoes and sure-footedness are a must, and some sections may even require alpine experience. Altitude sickness is a major concern, so plan to spend time acclimatizing at the VIS. Always carry plenty of water, as the arid environment offers no resupply points. Check weather conditions before you go, as they can change rapidly at this elevation.

• Distance: 7.2 miles (11.5 km)
• Elevation gain: 3105 feet (946 metres)
• Difficulty: difficult
• Estimated time: 4 hours and 42 minutes