Trail

Maunaulu via Nāpau Trail

Trail
Forested cinder cone with a black lava tree in the foreground

This is a 2.5-mile roundtrip hike across a raw 1969-74 lava landscape to a forested cinder cone, Pu'uhuluhulu. The first mile is deceptively technical—uneven, ankle-twisting lava terrain with zero shade. The final 1/4 mile is a sharp 210-foot climb that demands grit. Payoff: summit views of Mauna Loa, Mauna Kea, and the Pacific Ocean on clear days. Difficulty: Moderate intensity, high exposure. Bring extra water and high-ankle boots—this isn't a walk.

Quick facts

Distance Miles
2.5
Route Type
Out-and-back
Difficulty Level
Moderate
Elevation Gain Feet
210

Trail profile

Distance Miles
2.5
Route Type
Out-and-back
Difficulty Level
Moderate
Elevation Gain Feet
210
Estimated Time
2-3 hours
Trail Surface
Rough, uneven lava flows with ankle-twisting fragments
Trail Features
  • Lava tree molds
  • 1969-1974 lava flows
  • Forested cinder cone (Pu'uhuluhulu)
  • Panoramic views of Mauna Loa and Mauna Kea
  • Views of Pacific Ocean on clear days
  • Views of Pu'uʻō'ō cone (inactive, in distance)
Trail Highlights
Climb 210 feet to the forested cinder cone summit for panoramic views of Mauna Loa, Mauna Kea, and the Pacific Ocean. Walk across the dramatic 1969-74 Maunaulu lava landscape, a window into active volcanism.

Trailhead & access

Trailhead Location
Maunaulu Parking Lot, approximately 100 yards from parking area
Shuttle Required
0
Shuttle Details
Shuttle not required or available

Permits & conditions

Permit Details
No permits or reservations required
Fees
$30 — Entrance - Private Vehicle (park entrance fee applies; no additional activity fees)
Trail Status
Open
Seasonal Closures
None known; trail is accessible year-round

Facilities & rules

Restrooms At Trailhead
0
Water Sources
No water sources along trail—carry all water needed
Accessibility
Rough and uneven terrain with steep incline. Not wheelchair-accessible. Requires solid footing and balance.

Safety & strategy

Hazards
  • Rough, uneven, ankle-twisting terrain
  • Deep earth cracks and unstable lava
  • Razor-sharp lava fragments
  • Full sun exposure with no shade
  • Heat and dehydration risk
  • Steep 1/4-mile climb to cinder cone
Hazard Details
The lava field presents multiple hazards: rough, uneven terrain ankle-twists easily; deep earth cracks can catch feet; razor-sharp lava fragments cut skin. The first mile is fully exposed to the sun with zero shade—heat exhaustion and dehydration are real risks. The final 1/4-mile climb to Pu'uhuluhulu cinder cone is steep (210 feet) with exposed sides, though no drop-offs. Stay alert, step deliberately.
Best Season
Year-round (park is open 24/7); cooler dry season (May-September) may be more comfortable
Best Time To Visit
Start by 7:00 AM to beat the heat and sun exposure. The lava field is an oven by mid-morning. Early arrival gives you a cooler window and better visibility for Mauna Loa and Mauna Kea views.
Tips Advice
  • Bring 2+ liters of water—the lava field is sun-exposed with zero shade
  • Wear high-ankle boots or sturdy hiking shoes—ankle injuries are common on rough lava
  • Tighten your boots before starting—loose feet will hurt fast
  • Don't touch lava formations or ahu trail markers—they're fragile
  • Stay on the marked ahu trail—the lava field is disorienting
  • Bring a wide-brimmed hat, sunscreen (SPF 50+), and rain gear
  • Watch for deep earth cracks and unstable lava—step deliberately

More details

Park Area
Maunaulu area, East Rift Zone
Trail Markers
Marked with ahu (stacked rock cairns) across the lava field. Download the NPS Maunaulu Trail Guide PDF for navigation reference.
Dogs Allowed
No
Biking Allowed
No
Shade Level
Full sun across lava field; minimal shade on forested cinder cone summit
Map Recommended
1
Snow Dates
Not applicable—tropical climate, no snow
Mud Season
Not applicable—lava field is self-draining
Fall Colors Peak
Not applicable—tropical environment
Insider Tips
  • The false-flat sections across the lava will trick your feet—ankle support matters; wear high boots
  • Don't stop at the saddle between lava flows—push to the cinder cone summit for the payoff views
  • Stay disciplined on the marked ahu trail; it's easy to veer off and get disoriented
  • The climb looks short but is steep and relentless—prepare mentally
  • Clear days (rare) give you Mauna Loa and Mauna Kea views; cloudy days block the summit view
Recent Updates
None mentioned; an official NPS Trail Guide PDF is available for download
Family Friendly Notes
The steep climb and rough terrain challenge small children. The 1/4-mile summit push is a lung-buster—hold hands on steep sections. Full sun exposure demands heat preparation. Ankle-twisting lava is tough on young hikers. Ages 8+ with hiking experience and good boots recommended.
Nearby Facilities
No facilities at trailhead. Bring all supplies (water, snacks, sunscreen). Nearest restrooms and food are at the park visitor center area.
Review Summary
Hikers report the lava terrain is much rougher than expected—ankle injuries are common. The climb to Pu'uhuluhulu is steep but short, with payoff views of Mauna Loa and Mauna Kea on clear days. Most rate it as doable for moderate fitness, but sun exposure and rough ground demand preparation and respect.

Location

Frequently asked questions

How bad is the lava terrain really?

Very rough. Sharp, uneven, ankle-twisting fragments. Wear high-ankle boots and move deliberately. Most hikers underestimate the ankle challenge.

Is this safe to hike alone?

Yes, if you're fit and prepared. The trail is marked, the park is staffed, and you're never far from help. Tell someone your itinerary. Carry a phone (cell service unknown). Make smart decisions.

Can I hike this on a hot day?

Not recommended. The lava field has zero shade and no water sources. Go early (start by 7 AM) or skip it. Heat exhaustion and dehydration are real risks on exposed volcanic terrain.

Do I need trekking poles?

Highly recommended. Poles reduce knee impact on the descent and provide stability on uneven lava. They're especially helpful for the steep cinder cone climb.

What if I'm scared of heights?

The cinder cone has steep sides but no true drop-offs. The exposure is moderate, not extreme. Manageable if you don't look straight down during the climb and keep your focus on the trail.

How much water should I bring?

Minimum 2 liters; 3+ liters is smarter for this exposed terrain. There are zero water sources along the trail. Dehydration impairs judgment on rough ground—don't skimp.

Are the views really worth it?

Yes. The summit offers 360-degree views: Mauna Loa, Mauna Kea, the Pacific, and a window into the 1969-74 eruption. On clear days, it's world-class. Cloudy days block the view—check weather before you go.

Footprints Area

Ancient footprints frozen in volcanic ash. Short but serious: steep, exposed, and unforgiving.

Devastation Trail

1-mile paved cinder views with zero elevation. Easy for all ages, brutal sun exposure. Nēnē geese—respect distance.

Halemaʻumaʻu Trail

Drop 425ft into the crater. Uneven lava, full sun, panoramic payoff. Poles and water mandatory.

Keanakākoʻi

Crater views and volcanic history without the technical climb. Bring water and sun armor—exposure is real.

Kīlauea Iki Trail

Drop 400 feet into a live volcanic crater and cross its hardened lava lake. The ascent punishes quads. Come early.

Some booking links below are affiliate links, which may support YourNPGuide at no extra cost to you. Affiliate disclosure.

Sources

Editorial review: YourNPGuide Editorial Team. Information is compiled from official sources, verified traveler reviews, and editorial research; no firsthand visit is implied unless explicitly documented. Learn how YourNPGuide works.

Last updated July 2026. Report an issue.