Hiking the Puʻu Huluhulu Trail on the Big Island of Hawaiʻi
Distance: 1.3 miles / 2.1 km
The Puʻu Huluhulu Trail is one of the most beautiful and easy hikes off Saddle Road.
That being said, Puʻu Huluhulu isn’t just one trail, but rather, a network of small loop trails around an old cinder cone, which is reflected in the distance above.
This distance is the combined distance of all the trails around Puʻu Huluhulu, which is exactly how I recommend hiking the trail.
Puʻu Huluhulu Trailhead Parking
Parking for the Puʻu Huluhulu Trail is located at either one of two trailheads.
First, you can park directly off the Mauna Loa Observatory Road, which is what I recommend, or you can park in the parking lot off of Saddle Road. I recommend reading through the next section below to learn more about each trailhead.
Google Maps Directions: Puʻu Huluhulu (Mauna Loa) / Puʻu Huluhulu (Saddle Road)
Hiking the Puʻu Huluhulu Trail
While the Puʻu Huluhulu Trail can begin from either the Saddle Road or the Mauna Loa Observatory Trailhead, I think both routes are best for different reasons.
If you’re mostly interested in hiking to the top of Puʻu Huluhulu, I recommend beginning from the trailhead off Saddle Road because it’s the most direct.
However, if you want to explore all of the short little loop trails around Puʻu Huluhulu, I recommend starting from the Mauna Loa Observatory Road, which will make more sense on the return hike shown at the end of this post.
I started from the Mauna Loa Observatory Road, as this is the route I prefer to hike Puʻu Huluhulu.
Regardless of which trailhead you choose, both routes start by climbing up a short, steep trail almost immediately after leaving the trailhead.
ʻIliahi-ʻAmakihi Spur Junction
At the first split in the trail, go right to continue up to the main trail around the Puʻu Huluhulu cinder cone.
The trail to the left leads to the ʻAmakihi Loop, which is the trail I recommend taking back down at the end.
This species of Pilo is endemic to the upper elevations of Maui and Hawaiʻi Island only.
ʻAmakihi-ʻApapane Junction
At the next split, go right once again to reach the main Puʻu Huluhulu Loop Trail.
Koa-Pilo Junction (Puʻu Huluhulu Loop)
The Koa-Pilo junction is the split for the main trail that loops around Puʻu Huluhulu.
If you’re most interested in summiting, then the trail to the right, the Pilo Trail, is fastest way to the top.
However, I highly recommend hiking around Puʻu Huluhulu because the loop is so short and beautiful!
This is exactly what I did. Therefore, I went left on the Koa Trail, which in my opinion, is one of the most beautiful part of Puʻu Huluhulu.
This next stretch is the most beautiful in the early morning light!
Koa-Summit Junction
At the next split on the back side of Puʻu Huluhulu, continue straight if you want to continue around the loop trail, or go right to hike the short trail up to the top.
I chose to go straight around the loop, as there is another way up to the top further ahead.
Naio-Old Quarry Junction
At the next split shortly after the summit junction, you’ll want to decide whether it’s worth it loop around the lower parts of Puʻu Huluhulu on the Old Quarry Trail or stay up higher by going right on the Naio Trail.
I choose to go left to complete the larger loop because the trails around Puʻu Huluhulu are so quick and easy, but know that taking the Naio Trail is by far the fastest way to complete the loop back to the beginning.
That being said, if you’re only interested in the upper Puʻu Huluhulu Loop (Naio Trail), I recommend summiting at the junction shown above. It’s the easier of the two trails up to the top.
Old Quarry Trail
Since I decided to continue around the 'longer' Puʻu Huluhulu Loop, I took the Old Quarry Trail back down and around to the Saddle Road Trailhead.
Puʻu Huluhulu Trailhead (Saddle Road)
This is where the hike would have begun had you decided to begin at the trailhead off Saddle Road.
Pilo-Naio Junction
If you’ve chosen to hike around Puʻu Huluhulu in the same direction as I have, go right on the Naio Trail to take the fastest route up to the top.
The trail to the left leads back to where this post began, which is the route down shown later in this post.
At this split in the photo on the left, go left to stay on the Naio Trail.
Naio-Summit Junction
Once back below the summit, you can either go straight and take the easier route to the top that was shown earlier in this post, or go left here to take the fastest route to the top.
I went left, and even though the trail doesn’t look like much, it’s fairly easy to get up.
Puʻu Huluhulu
Not only is Puʻu Huluhulu an important ecological forest for native Hawaiian plants and birds, but the cinder cone is also a sacred Hawaiian site.
Please be respectful.
This is the view looking out toward Mauna Kea.
From the top, the easiest way back down is the route mentioned earlier from the Koa Trail.
Koa-Summit Junction
Once back at the Koa Trail, go right to repeat the same short stretch shown previously, which is the fast route back to the Mauna Loa Observatory Road.
Naio-Old Quarry Junction
Then, go right once again at the Naio-Old Quarry junction from earlier in this post.
Naio-Saddle Road Junction
This is the same junction from the trailhead off Saddle Road.
Go right to continue back to the Mauna Loa Observatory Road.
Koa-Pilo Junction (Puʻu Huluhulu Loop)
This the original split where the trails off the Mauna Loa Observatory Road met up with the larger Puʻu Huluhulu Loop Trail.
Go left to hike back down to the beginning.
ʻAmakihi-ʻApapane Junction
This next junction is where the Puʻu Huluhulu Trail split for the second time.
While you could go left to continue back down the same ʻIliahi Trail, I recommend going right in order to complete all the trails around Puʻu Huluhulu.
ʻIliahi-ʻAmakihi Spur Junction
This is the short spur junction that connects the two trails from the beginning.
Go right to continue back down on the ʻAmakihi Trail.
From the the trailhead, you’d probably never even notice the ʻAmakihi Loop off to the left, which is exactly why this post is written in the way it is.
Overall, this is the general route I recommend hiking if you’re interested in seeing all the trails around Puʻu Huluhulu, as it’s what makes the most sense to be able to start and return on slightly different trails.
Native Plants on the Puʻu Huluhulu Trail
The Puʻu Huluhulu Trail is one of the most beautifully preserved mesic native forests, and I ask that you do you part to minimize your impact in this pristine habitat.
Some of the native plants that you can expect to see include ʻIliahi, Koa, Pilo, ʻĀkala, ʻĀnunu, and Naio, to truly only name a few.
If you would like to learn more about identifying these and tons of other native plants from across the Hawaiian Islands, I encourage you to scroll through my separate post.
Read My Separate Post: Native Hawaiian Plant Guide
