This remote hike on the Haleakalā backside is more reminiscent of a southwestern mainland desert hike than what one typically conjures when thinking about Maui. That’s the allure of this hike. It’s a wild, alien landscape on the dry side of the island where violent flash floods crashing down from Haleakalā volcano create canyons like Pahihi Gulch. There are many such dry watercourses along Haleakalā’s backside, but Pahihi is the most user-friendly with the best access. This is a real wilderness adventure and an off-trail hike.

Trailhead: Along Hwy. 31 on the Haleakalā backside find the spot where Pahihi Gulch crosses the highway at mile marker 29.5. Park off the highway. It’s a good idea to park away from the low point of the road in case of flash flooding — there are actually good spots on either side. There are no services at this trailhead. It’s an incredibly bad idea to park a vehicle here or linger if it is raining hard uphill. This canyon was carved by flash floods.

Weather

Gear: Standard hiking gear. Boots are a must for this off-trail hike over broken terrain. Bring plenty of water and sun protection.

Hike: Don’t even think about doing this hike if it is raining uphill. This area is used by hunters, especially on weekends, so wear some bright clothing and never hike alone. From the parking area, hike north into the broad gulch past large boulders. Stay near the center of the gulch and away from the cliff walls where rockfall danger is high. There are some short use trails, but in general, you need to find the best way for yourself. You’ll likely be watched by goats on the cliff walls (they create even more rockfall). After about 3/4 of a mile the gulch tightens and you’ll find a small hill created by erosion. Shortly after the small hill, the gulch splits and travel becomes unsafe and difficult. There are some interesting dry falls created by flash floods. Don’t hike up into the rapidly narrowing gulch - rockfall danger becomes impossible to mitigate even with a helmet. Enjoy and return the way you came.