Keoneheʻeheʻe to Halemauʻu Trail

This is an 11-mile, one-way hike from Keoneheʻeheʻe at the summit to Halemauʻu, across Haleakalā’s high crater. It takes most of a day; allow about seven hours on foot. I’d choose it for the full basin crossing, but the point-to-point ride is part of the outing and the last climb is demanding.

There’s no hiker shuttle. The simplest setup is to leave your car at Halemauʻu and arrange a ride up to the summit start, so your car is waiting at the finish. If you enter the summit area between 3 and 7 a.m., check the current sunrise vehicle reservation rule before you go.

From about 9,740 feet, the trail drops nearly 2,500 feet over its first 3.9 miles. The soft cinder shifts underfoot like beach sand, so even the downhill takes effort. Save some energy for later; this is only the opening stretch.

After reaching the floor, the route heads north toward Halemauʻu through open cinder and lava country. It passes the Halāliʻi cone and Kawilinau, a 65-foot volcanic pit, about 5.7 miles from the start. Stay on the marked tread and admire the pit from a safe distance.

The trail turns onto steep, narrow switchbacks cut into the crater wall and climbs to the 7,990-foot Halemauʻu trailhead. The last miles are a hard finish after a long day at altitude; expect the landscape to shift from bare cinder to a greener rim.

Despite its familiar name, Haleakalā’s summit basin wasn’t made by a single collapse or explosion. It formed as two large valleys grew and joined. The cones and lava flows scattered across the floor are much younger, giving this walk a close look at several stages of the volcano’s history.

There’s no food or dependable water stop along the crossing, and nothing is sold in the park. Bring enough food and water for the day, sturdy shoes, sun protection, and warm rain gear. Summit weather changes quickly; temperatures can fall below freezing with wind chill.

The upper alpine desert is home to the endemic ʻāhinahina, or Haleakalā silversword. Its roots are fragile, so keep to the trail and don’t step among the plants. Pets are prohibited on park trails, and hiking groups are limited to 12.