Mauna Loa Trail

Why hike it

If you’re into vast, otherworldly volcanic terrain and serious Type 2 fun, this is your Big Island epic. Starting at the Mauna Loa Lookout, the route climbs from patchy ʻōhiʻa and shrubland into stark lava fields with panoramic views and the occasional glimpse of the Pacific. It’s rugged, exposed, and unforgettable.

Distance and difficulty

Plan on 36.2 miles total out-and-back to the Mauna Loa Cabin (18.1 miles one way). This is a very hard, high‑elevation trek over rough lava and cinder with little to no shade. Expect over 3,000 feet of gain to the first cabin (Red Hill/Puʻu ʻUlaʻula) and more as you continue upward. Rock cairns mark the way, which matters because the landscape can feel like a maze of black rock.

What you’ll see

Lava everywhere—ropy flows, rugged ʻaʻā, and reported lava tubes along the route. Vegetation thins out quickly after about 8,100 feet, leaving a lunar vibe with big‑sky views. On clear days you’ll catch the ocean far below; up high, it’s all wind, sky, and volcanic forms.

Logistics that matter

• Trailhead: Mauna Loa Lookout at the end of Mauna Loa Road (park at the lookout/picnic area).
• Overnights: Backcountry permits are required for cabins; they’re first‑come, first‑served. Rangers suggest asking how many permits are out to gauge crowding—bring a pad in case you end up on the floor. There’s no flowing water; only catchment water at Red Hill and Mauna Loa Cabins, and you must treat it. A park entrance fee applies; overnight permits have an additional fee and must be picked up in person 24 hours prior.
• Current access note: The National Park Service states the Mauna Loa Summit Cabin is not accessible from the Mauna Loa Trail due to 2022 eruption damage. This directly affects summit plans from this route.

Trail vibes and navigation

This is cairn‑to‑cairn navigation across repetitive terrain. Do not disturb the rock piles—they’re your lifeline in low visibility. Bring a map/GPS, and be ready to turn around if clouds roll in.

Best time to hike

Open year‑round, but fall and spring generally offer milder weather and clearer skies. Start early for cooler temps and calmer winds. Always check current NPS conditions and closures before you go; weather can change fast at altitude.

Should you do it?

For experienced, self‑sufficient backpackers who want raw volcanic scenery and solitude, absolutely. If you’re after a quicker lava fix with less commitment, consider other park hikes—this one is a multiday grind with massive exposure and no water on trail.