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Hiking trails & Routes

Hawaiʻi County

Keauhou Trailhead – Alae Crater loop from Mauna Ulu

Hiking trails & Routes

Hawaiʻi County

Keauhou Trailhead – Alae Crater loop from Mauna Ulu

Moderate

4.5

(2)

7

hikers

Keauhou Trailhead – Alae Crater loop from Mauna Ulu

02:01

7.42km

100m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Last updated: May 8, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

East Rift Wilderness

Hawaiʻi Volcanoes National Park

Waypoints

A

Start point

Get Directions

1

1.87 km

Keauhou Trailhead

Highlight • Trail

The Puʻu Huluhulu Trailhead is the start of the Nāpau Crater Trail along the Mauna Ulu lava shield. The trail leads past four notable craters: in order of distance from the trailhead these are the overgrown Pu’u Huluhulu Cinder Cone, the deep barren chasm of Alae Crater, the flourishing Makaopuhi Crater, and historic Nāpau Crater. Nāpau Crater features a vast overlook to the recently active Pu'u 'Ō'ō cone (which erupted 1983 to 2018) and a cabin which is open for camping reservations.

Tip by

2

1.95 km

Puʻu Huluhulu Trail

Highlight • Trail

3

5.69 km

Alae Crater

Highlight • Volcano

Alae Crater is 540 feet deep. During the 1969 eruption Alae Crater nearly completely filled with lava over the course of 13 different episodes.

Tip by

B

7.42 km

End point

Way Types & Surfaces

Way Types

7.41 km

Surfaces

7.41 km

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Elevation

Elevation

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Weather

Powered by Foreca

Friday 10 July

31°C

20°C

51 %

Additional weather tips

Max wind speed: 24.0 km/h

to get more detailed weather forecasts along your route

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