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The trail to the summit of Le-ahi was built in 1908 as part of US Army Coastal Artillery defense system. Entering the crater from Fort Ruger, through several tunnels, the trail scaled steep interior western slopes of the crater to summit. The dirt trail with numerous switchbacks was designed for mule and foot traffic. In the old days the mules hauled construction materials. The Kahala Tunnel was built in the 1940s and is the public entrance today.

From the trailhead to the summit of Diamond Head Crater, the hike of 0.8 mile (1.3km) one way takes climbers to 560ft (171m) from the base. The trail follows an uneven and steep terrain requiring caution and proper footwear, some portions involve steep stairways. Other portions of the the trail go through a long dimmed light tunnel. The weather here is always hot, a hat, sucreen and plenty of water are recommended. Allow 1.5 to 2 hours for a safe and leisurely round trip hike.



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