10 Most Challenging Trails on Oʻahu, Hawaiʻi
I was keen on avoiding the word 'hardest' when choosing a title for this article, as this list does not contain the hardest hikes on Oʻahu.
In fact, the hardest hikes on Oʻahu have names that most have never even heard of, which was not the intention of this post.
Instead, I wanted to create a list of the most challenging trails–meaning, trails with a clear starting point and ending point. This is why I left out both the Koʻolau Summit (KST) and Waiʻanae Summit Trail (WST), as I wanted to keep this list to what one would more typically consider a 'trail.'
This is why the following list excludes random hairline ridges and climbs, because truthfully any long-time Oʻahu hiker would know this list could go on and on. Perhaps that’ll be a post for the future!
All that being said, please take the following warning to heart, as it comes from a place of compassion, not cockiness. I have personally lost a close friend while hiking in Hawaiʻi, and I don’t wish the same for anyone else.
Warning
Hawaiʻi hiking is harder than the U.S. mainland.
I have completed some of the more challenging hikes and climbs around the world, including Denali in Alaska, Capitol Peak in Colorado, and even Gannett Peak in Wyoming, all for the fun of it, and I can honestly say that hiking in Hawaiʻi is harder than anything I’ve experienced elsewhere thus far.
Casual days in areas that shouldn’t be sketchy can turn sketchy in just moments, and there have been many times on random day hikes in Hawaiʻi that have been far more challenging and dangerous than even the highest peak in North America could have thrown at me!
Now, most of the trails on this list aren’t that extreme in nature. That’s not to say that they don’t have their challenges, but by and large, the trails below are challenging and rewarding day hikes, not hairline ridges!
10 Most Challenging Trails on Oʻahu
With the exception of the first one, the following list is written in no particular order of best or worst.
I do think that it’s worth noting how the vast majority of trails on the list below come from the Koʻolau Mountain Range, which should show where the challenging hikes on Oʻahu lie.
1. Castle Trail
Distance: 9.3 miles / 15.0 km
The Castle Trail is a long, remote, overgrown adventure in the northern Koʻolau Mountains that climbs a very steep trail known as Papali Ridge, descends into a remote, often untrafficked drainage, then climbs out on the far side before descending a non-existent historic trail into Punaluʻu Valley that, for all intents and purposes, has been lost to time!
It’s for all these reasons that I believe the Castle Trail is the most challenging hike on this list, and it’s certainly not an adventure I recommend to just any average hiker—especially considering the challenges on the Punaluʻu side of the hike.
Read My Separate Post: Castle Trail
2. Schofield-Waikāne Trail
Distance (Roundtrip): 14.0 miles / 22.5 km
The Schofield-Waikāne Trail is the longest state-managed trail on Oʻahu, but as far as difficulty goes, it’s quite a deceiving adventure!
By this, I mean that the Schofield-Waikāne Trail is very long and remote, but it is much easier than such an adventure would lead one to believe, especially considering the conditions of other central Oʻahu trails, like the Waimano Trail farther south.
With all that in mind, the Schofield-Waikāne Trail can best be compared to the Poamoho Trail—not to mention, much of the beginning follows a long road to the true trailhead, from which point the trail only climbs another 700 ft. (213 m) to the Koʻolau Summit.
This is all to say that the Schofield-Waikāne Trail is one of my favorite long day hikes on Oʻahu, and the only reason it could possibly be considered hard is because of the long one-way distance.
Read My Separate Post: Schofield-Waikāne Trail
3. Puʻu ʻŌhulehule Trail
Distance: 8.2 miles / 13.2 km
The Puʻu ʻŌhulehule Trail is a long, tedious, and steep day hike in Kahana Valley on the east side of Oʻahu that climbs to the summit of the very distinct and remote, pyramid-looking peak that can be seen from miles around, including notable places like the Poamoho Trail and the Crouching Lion Trail.
It is for this reason that few hikers venture up the long trail, notably because I can guarantee you will end the hike soaked and likely very muddy!
Yes, there’s no way around getting soaked waist-deep, if not more depending on your height, as the very beginning of the Puʻu ʻŌhulehule Trail crosses a very deep stream, only setting the stage for everything to come higher up the mountain!
However, if you think you’re up for a fun, remote, all-day adventure, the PuʻuʻŌhulehule Trail is really is a fun trek—as long as you are prepared for the long day you’re getting into!
Read My Separate Post: Puʻu ʻŌhulehule Trail
4. Tripler Ridge Trail
Distance: 9.2 miles / 14.8 km
The Tripler Ridge Trail is a long day hike in central Oʻahu that begins at one of two different trailheads before both routes meet and eventually climb a somewhat tedious ridge to the Koʻolau Summit.
That said, the two trailheads to consider are either the Tripler Ridge Trail via Tripler Army Medical Center or the Moanalua Valley Trail, which is also the beginning of the Kulanaʻahane Trail.
As for either, choosing where to begin usually comes down to whether or not you have base access or know someone who does, as a valid DOD ID is required to hike the Tripler Ridge Trail via Tripler Army Medical Center.
If not, the only way up Tripler Ridge is by hiking from the Moanalua Valley Trailhead, which only further increases the challenge of reaching the Koʻolau Summit, as there is quite a bit of elevation gain on the short ascent out of Kamananui Valley!
In either case, I discuss both routes and both trailheads in detail in my separate post linked below.
Read My Separate Post: Tripler Ridge Trail
5. Kapālama Ridge Trail (Puʻu Lanihuli)
Distance: 7.6 miles / 12.2 km
The Kapālama Ridge Trail to Puʻu Lanihuli is a challenging adventure on the south side of Oʻahu that climbs to the summit of a panoramic, standalone peak above Honolulu and the east side of the island!
Kapālama Ridge is often regarded as a long and tedious hike, and it’s for this reason that it’s often overshadowed by the neighboring Puʻu Kōnāhuanui Trail across Nuʻuanu Valley, largely because it takes so much effort to reach a significantly shorter Koʻolau peak.
However, 'challenging' does not mean technical, as there’s really nothing to prepare for beyond the overgrowth and a long day outside!
This is one reason why Puʻu Lanihuli is one of my favorite day hikes on the island, and on a clear day, there are amazing views of Kalihi Valley to the north, Nuʻuanu Valley to the south, and much of the island’s east side as far north as Mokoliʻi and Kualoa Ranch from the summit!
Read My Separate Post: Kapālama Ridge Trail (Puʻu Lanihuli)
6. Kūlepeamoa Ridge Trail
Distance (Roundtrip): 5.3 miles / 8.5 km
The Kūlepeamoa Ridge Trail is a steep but very beautiful ridge in Oʻahu’s southern Koʻolau Mountains that few hikers venture up compared to the surrounding trails, like Puʻu ʻO Kona, Kuliʻouʻou Ridge, and even Kamiloʻiki Ridge, which I believe is for one of two main reasons.
The first is that far fewer people know about Kūlepeamoa Ridge compared to the other, more popular day hikes that surround it.
The second is that Kūlepeamoa Ridge has quite a bit of elevation change over a very short distance, meaning it is one of the more challenging options in the area, similar to the Wailupe Loop Trail up the road.
However, unlike Wailupe, the Kūlepeamoa Ridge Trail is a much more straightforward day hike, so long as you don’t miss either the turn that climbs up and out of the valley or the turn off the ridge on the way back down.
All this aside, Kūlepeamoa Ridge is, in my opinion, one of the most beautiful sunset hikes on Oʻahu, though you certainly have to put in the effort to get the reward!
Read My Separate Post: Kūlepeamoa Ridge Trail
7. Keaʻau Middle Ridge Trail
Distance: 5.4 miles / 8.7 km
The Keaʻau Middle Ridge Trail is a little-known day hike on the west side of Oʻahu that climbs a steep, somewhat exposed ridge in the back of Keaʻau Valley to a beautiful panoramic summit, with views looking across Mākaha Valley and Mt. Kaʻala beyond!
In my opinion, the Keaʻau Middle Ridge Trail is one of my favorite Oʻahu day hikes, though it must be said that the very short trail climbs just under 3,000 ft. (914 m) from the trailhead to the summit.
On top of this, the Keaʻau Middle Ridge has numerous high-exposure sections with dramatic drops, which is what really sets it apart as one of the more difficult day hikes on Oʻahu.
However, if you think you’re up for the challenge, I think the Keaʻau Middle Ridge Trail makes for a great adventure if you’re looking to see if you’re ready for harder, more involved ridges across the island, which I discuss in more detail at the end of my article linked below.
Read My Separate Post: Keaʻau Middle Ridge Trail
8. Mānana Ridge Trail
Distance: 10.4 miles / 16.7 km
The Mānana Ridge Trail is a long, beautiful, state-managed day hike in central Oʻahu that climbs a very hilly, tedious ridge to one of the more remote summits across the long 56.0-mile (90.1 km) Koʻolau Mountain Range!
It is for all these reasons that the Mānana Ridge Trail is one of the more challenging adventures on this list, particularly because the ridge constantly climbs and loses elevation as it makes its way to the summit.
All that aside, the views from the upper elevations on the ridge and the summit are spectacular, and since Mānana is such a long adventure, the trail is not a busy hike by any means, especially when compared to others on Oʻahu, like the Kuliʻouʻou Ridge Trail and Mānoa Falls.
Read My Separate Post: Mānana Ridge Trail
9. ʻAiea Ridge Trail (Stairway to Hell)
Distance: 11.6 miles / 18.7 km
The ʻAiea Ridge Trail to Stairway to Hell is certainly one of the longer, more involved adventures on this—not to mention, I don’t believe the 5.8-mile (9.3 km) one-way distance is indicative of the trail’s true difficulty.
However, Stairway to Hell deserves a place on this list because it is arguably the most beautiful overnight backpacking adventure in the Koʻolau Mountains, and if you happen to catch sunrise from the stairs on a clear morning like this, you surely won’t be disappointed!
Now, I would almost never consider the ʻAiea Ridge Trail to Stairway to Hell to be anything but an overnight backcountry trip, unless you think of yourself and your group as very strong, independent hikers.
If so, Stairway to Hell could be reached quicker and easier with a lighter pack, but that would almost certainly mean beginning around midnight or earlier the night prior to catch sunrise, depending on how fast you think you can move in the dark!
Read My Separate Post: ʻAiea Ridge Trail (Stairway to Hell)
10. Lulumahu Ridge Trail
Distance (Roundtrip on Lulumahu Ridge): 4.6 miles / 7.4 km
Distance (Lulumahu Ridge to Nuʻuanu Trail): 9.0 miles / 14.5 km
The Lulumahu Ridge Trail is a very short and steep hike in the southern Koʻolau Mountains that climbs its way up a lesser-known ridge via Lulumahu Falls to the summit of Puʻu Kōnāhuanui!
That said, the reason there are two distances listed above is because the Lulumahu Ridge Trail really is that steep, and as a result, creating a loop with the Nuʻuanu Trail is a much easier, more practical way to hike back down.
In either case, I highly recommend reading my separate post, as there is quite a bit to know about the Lulumahu Ridge Trail, notably where the junction is located to start hiking up and out of Nuʻuanu Valley at the very beginning.
Read My Separate Post: Lulumahu Ridge Trail
Bonus: Kolekole Trail (Puʻu Hapapa)
Distance: 3.1 miles / 5.0 km
The Kolekole Trail to Puʻu Hapapa is a stunningly beautiful and little-known adventure in the Waiʻanae Mountains that I think is one of the most fun high-exposure trails on Oʻahu, largely because the steep climb is really not all that difficult—at least not as difficult as others on the island, like Mt. Olomana.
However, what all this doesn’t mention is that the Kolekole Trail is only open on select weekends, as the entirety of the hike is located on an active military installation.
While this may sound intimidating, accessing the Kolekole Trail is not difficult, which is why I highly recommend reading my separate post, where I share all the most important need-to-know details, including how to see if the trail is open!
Read My Separate Post: Kolekole Trail
Native Hawaiian Plants on Hawaiʻi Trails
I wanted to include this last section on this post because this is a subject that’s personal to me.
The native plant biodiversity in Hawaiʻi is insane, and I say this because 90% of the native plants that you will see around the islands are found nowhere else on Earth, which I mention for two reasons.
The first is that I ask that you please do everything you can to minimize your impact on Hawaiʻi’s trails, as many native plants across the islands at risk of extinction. The second is that if you have a personal interest in the subject or may be curious about something that you found, I wrote a separate post entirely about native Hawaiian plants, which hopefully can help to identify anything that you might be curious about!
For example, this species in the photo below can only be found on the Island of Oʻahu and nowhere else on Earth!
Read My Separate Post: Native Hawaiian Plant Guide
