AT A GLANCE
Why go?
The ʻAiea Loop Trail is a 4.8-mile forested walk on the hills above ʻAiea, Oʻahu, beginning and ending inside Keaīwa Heiau State Recreation Area at the top of ʻAiea Heights Drive. Graded easy to moderate, it follows a ridge on the west side of Hālawa Valley, trading rainforest shade for sweeping views that stretch from Pearl Harbor (Puʻuloa) and the Waiʻanae Range to Honolulu and Diamond Head (Leʻahi).↗↗↗
Most of this hillside was replanted by foresters in the late 1920s, so the loop reads as a living lesson in Hawaiian forest: fragrant lemon eucalyptus, stands of Norfolk Island pine, and native koa and ʻōhiʻa crowning the high point at Puʻu ʻUaʻu. With about 900 feet of gentle elevation gain, a steep switchback and a stream crossing near the end, the hike takes roughly 2.5 to 3 hours—and it rewards those willing to slow down and notice the trees, the birdsong, and the layers of history underfoot.↗↗
Good to know
- Hiking area
- Open daily7 AM–6:45 PM
- 4 kmfrom 'Aiea center
- Wheelchair accessparking lot
- Parking
- 4.7 / 5799 reviews
- 'Aiea
Walking the Ridge
Park at the trailhead off the upper eastern end of the park road, marked by parking lots, picnic pavilions and a restroom, then look for the trail sign. The loop can be walked in either direction and finishes at the lower campgrounds, where a short walk back along the one-way park road returns you to your car. It is not a strenuous route, but the gradual climbs, exposed tree roots and muddy stretches—especially after rain—make sturdy walking shoes worthwhile.↗↗↗
As the trail crests the ridge, the canopy opens to some of the best southern-coast panoramas on Oʻahu. On clear mornings the whole sweep from Pearl Harbor west to the Waiʻanae Range and east to Diamond Head lies laid out below you, a fine reward for the climb to Puʻu ʻUaʻu, the midpoint high point where native koa and ʻōhiʻa trees grow.↗↗
Forest, Birds and Hidden History
Keep your eyes and ears open. The ʻAiea ridgeline is one of Oʻahu's better chances to spot native forest birds such as the Oʻahu ʻamakihi, the Oʻahu ʻelepaio and the crimson-plumed ʻapapane, alongside startling introduced flocks, including endangered Mariana swiftlets and loud red-crowned parrots.↗
The forest also keeps secrets. Watch for the scattered remains of a B-24 bomber that crashed here in 1944, a quiet reminder of the wartime years when soldiers were camped on these same hills. At the park entrance, meanwhile, sits Keaīwa Heiau, a sacred Hawaiian healing temple (heiau hoʻola) enclosed by a four-foot stacked-rock wall, traditionally linked to a 16th-century Oʻahu chief and his kahuna and rededicated in 1951.↗↗
Before You Go
There is no entrance fee, and the park is open from 7:00 a.m.; hours close at 7:45 p.m. in summer (from April 1) and 6:45 p.m. in winter (after Labor Day). From Honolulu, follow H-1 to Moanalua Highway (Route 78), take the ʻAiea cutoff to the third traffic light, turn right onto ʻAiea Heights Drive and follow it about three miles up to the end of the road, then continue along the park road to the trailhead.↗↗↗
Bring water, wear good shoes and be ready for light passing showers, since the trail can turn muddy with slick roots. Stay on the designated path rather than side trails and shortcuts, pack out at least what you pack in, and remember that mountain biking is no longer permitted and open fires are prohibited. Dogs that come along must stay on leash. A few picnic pavilions and barbecue grills near the trailhead make it easy to add a meal to the end of your hike.↗↗↗
What makes it special
A 4.8-mile, easy-to-moderate forested loop that starts and finishes inside a state park on the ridge above ʻAiea.↗
Ridge-top views spanning Pearl Harbor and the Waiʻanae Range to Honolulu and Diamond Head.↗
Lemon eucalyptus fragrance, native koa and ʻōhiʻa at Puʻu ʻUaʻu, and birdsong from Oʻahu ʻamakihi, ʻelepaio and ʻapapane.↗↗
Wartime history and sacred ground: a 1944 B-24 crash site and the nearby Keaīwa Heiau healing temple.↗↗
No entrance fee, free parking and restrooms at the trailhead, with picnic pavilions to end your hike.↗
A little planning goes a long way
- Go early on a clear morning for the sharpest ridge-top views; light showers can still make the trail muddy, so wear shoes with good grip.↗
- Allow 2.5 to 3 hours at an unhurried pace and carry drinking water—there is nothing to refill on the loop.↗↗
- Follow the park road back from the lower campgrounds to your car rather than looking for a second trailhead.↗
- Visit Keaīwa Heiau at the park entry before or after hiking, and treat the rock walls with respect—do not move stones or leave offerings.↗
About this guide
Compiled with AI assistance from the sources below; this is not a first-hand visit. Place details collected October 5, 2026. Hours, access and ratings can change; confirm with the venue before visiting.
