Mauna Loa

The Basics

Set within Hawaii Volcanoes National Park, Mauna Loa’s unfurling flanks make up half the landmass of the Island of Hawaii, and its 13,679-foot (4169-meter) peak is high enough to catch the occasional snow. Most visitors to Mauna Loa explore the volcano on a scenic drive—you can also book a guided tour to enjoy the views without worrying about driving. If you want to explore on foot, opt for guided treks ranging from day hikes to multi-day backpacking trips. To get a scope of the true size of the volcano, take a helicopter flight above Hawaii Volcanoes National Park.

Things to Know Before You Go

• It can be cold and windy on the mountain, so bring warm layers and a windbreaker if you plan to get out of your vehicle.

• Multi-day hikes require permits and spots are limited, so contact the National Park Service before planning a backcountry trip.

• Some areas (such as the Mauna Loa Lookout) have wheelchair- and stroller-accessible walkways and vault toilets.

• Volcanic rock makes sturdy shoes a necessity if you want to hike the trails.

How to Get There

Mauna Loa is located an hour’s drive from Hilo, within the Hawaii Volcano National Park. A popular choice for viewing the park is to drive Saddle Road, which cuts between Mauna Loa and Mauna Kea. To explore the upper reaches of Mauna Loa, turn off Saddle Road onto Mauna Loa Observatory Road and follow it to the Mauna Loa NOAA Atmospheric Observatory, which sits just below the summit at 11,140 feet (3395 meters).

When to Get There

While the mountain is a popular destination year-round, plan your trip in the spring or fall to avoid the worst crowds. You can also visit in the late evening or even after dark for stargazing. Trail closures are common in the park, so check the Hawaii Volcanoes National Park website before planning a hike.

Hiking to the Summit of Mauna Loa

The summit of Mauna Loa can only be reached on foot and is accessible by two backpacking routes. Both are considered strenuous due to rugged terrain and high altitude. You can choose a challenging day hike that begins at the Mauna Loa Observatory or a trek of more than 30 miles (48 kilometers). The route includes cabins where hikers can stay along the way.

What is the difference between Mauna Loa and Mauna Kea?

Mauna Loa and Mauna Kea are separate volcanoes with very different characteristics and chemical compositions. Mauna Kea is steeper and more irregularly shaped than Mauna Loa because its lava has a higher viscosity. Mauna Kea is the world’s tallest mountain from its under-sea base to its summit, while Mauna Loa is the world’s largest active volcano.

Which island is Mauna Loa on?

Mauna Loa is on Hawaii Island (the Big Island). It comprises around 51% of the island’s land area. It covers most of the southern and central parts of the island. It’s a massive volcano: Its dome is 75 miles (120 kilometers) long and 64 miles (103 kilometers) wide, and its summit caldera covers nearly 6 square miles (15 square kilometers).

Can you go on Mauna Loa?

Yes, it’s possible to visit and walk on Mauna Loa. It covers over 50% of Hawaii Island (the Big Island). As well as driving past and getting views of the volcano from different viewpoints, adventurous travelers can go backcountry hiking on Mauna Loa on two main trails: the Mauna Loa Trail and the ʻĀinapō Trail.

Where is the best place to see Mauna Loa?

Mauna Loa makes up more than 50% of Hawaii Island (the Big Island), so you can see it from many places on the island. To see Mauna Loa’s lava flow (when conditions are right), Hawaii Island’s Daniel K. Inouye Highway, also known as Saddle Road, is a convenient spot, especially the Gilbert Kahele Recreation Area.

Is Mauna Loa worth visiting?

Yes, Mauna Loa is worth visiting if you’re interested in natural phenomena. Mauna Loa is the world's largest active volcano, so visiting can be a memorable experience. How much you can see on a visit and how close you can get to the lava flows depends on the volcano’s activity and whether roads and trails are safe enough to open.

Can you see Mauna Loa from Kona?

Yes, you can see Mauna Loa from Kona. Kona is located on the western coast of Hawaii Island (the Big Island), and Mauna Loa comprises more than 50% of this island, mainly the southern and central areas. You may also see the Mauna Loa lava flow from Kona, depending on the conditions and how active the volcano is.

Ways to explore

Set within Hawaii Volcanoes National Park, Mauna Loa’s unfurling flanks make up half the landmass of the Island of Hawaii, and its 13,679-foot (4,169-meter) peak is high enough to catch the occasional snow. Most visitors to Mauna Loa explore via scenic drive and stop at the lookout. Guided tours, though, allow you to enjoy the views without worrying about driving.

If you want to explore on foot, opt for guided treks ranging from day hikes to multi-day backpacking trips (permit required). To get a scope of the volcano’s massive size, take a helicopter flight above the national park.

Accessibility

Not recommended for travelers with mobility limitations—it’s extreme terrain at high altitudes.

Age limits

Technically none, though hikers should be experienced

What to pack

Activity-dependent, though always bring water, snacks, and a first-aid kit

What to wear

Activity-dependent, though all visitors will want layers

Not allowed

Fires, dogs, littering

Amenities

Scenic lookout, composting toilets at shelter cabins only

Address

As the world's largest active volcano, there are multiple access routes to Mauna Loa, but current road conditions significantly impact access. Check for updates before your visit.

Driving

Take Highway 11 to the Kilauea Visitor Center, then take Mauna Loa Road for about 20 minutes to the Mauna Loa Lookout, which is open during construction.

Public transportation

Public transportation isn’t available to the volcano—you’ll need a taxi or rideshare.

Best times to visit

Early morning starts are essential (before 6:30am) for day hikes to avoid afternoon weather.

Best days to visit

Clear weather days are a must—don’t attempt hiking around Mauna Loa in fog, clouds, or in poor visibility.

Best months to visit

March through September is the most popular time for hiking, though it’s a year-round destination.