Scuba Diving in Kona

Diving in Kona happens on the sheltered leeward coast of the Big Island, tucked in the rain shadow of Mauna Kea and Mauna Loa, and that geography is why Kona has the calmest, clearest, most consistent diving in Hawaii. The coastline is young volcanic rock, so the terrain underwater is all lava, tubes you can swim through, arches, caverns, and pinnacles that drop onto sand and deep blue water just a short boat ride from shore. Visibility runs 60–100+ ft (18–30+ m) most days, and the water sits between 75 °F (24 °C) in winter and 81 °F (27 °C) in late summer, warm enough for a 3mm suit year-round.

What sets Kona apart from anywhere else in the state is two dives you can't reliably do many other places on Earth. The first is the manta ray night dive, where you kneel in a circle of light on the sand and watch reef mantas with 12 ft (3.7 m) wingspans barrel-roll through the plankton inches over your head. The second is blackwater diving, a tethered night dive in open ocean over thousands of feet of water, where the deep-scattering layer rises after dark and drifts past your light like an alien parade. Add reliable green turtle cleaning stations, resting whitetip reef sharks, and humpback song filling the water from November to May, and Kona earns its spot as the Big Island's headline dive region.

Almost all boat diving runs as day-boat charters out of Honokohau Harbor, with short rides to the sites since deep water sits so close to shore. Shore diving exists at spots like Two Step and Puakō, but the boats are where Kona shines.

Best dive sites in Kona

The best dive sites in Kona range from beginner-friendly lava gardens to a bucket-list blackwater drift, and most sit within a short run of Honokohau Harbor.

Garden Eel Cove (Manta Heaven)

This is Kona's flagship, and the reason many divers book a trip here at all. By day, Garden Eel Cove is a gentle reef sloping to a sand flat where garden eels sway at around 60 ft (18 m). After dark it transforms into the manta ray night dive: you settle onto the sand at about 30–40 ft (9–12 m), aim your light up, and the beams pull in clouds of plankton. The mantas come to feed, looping and barrel-rolling so close you have to resist the urge to reach out. It's run as a two-tank trip, a reef dive at dusk and the manta dive after nightfall. The northern site, Manta Heaven, sits off Keahole Point near the airport and has better swell protection and fewer boats than Manta Village to the south.

Depth: 30–40 ft (9–12 m) at the viewing area | Level: All Levels

Long Lava Tube (Suck 'Em Up)

A classic Kona lava-tube dive that shows off exactly what volcanic diving is about. You drop in and swim into a wide arch that opens into a lava tube threaded with skylights, or "pukas," where shafts of sunlight punch through the ceiling and light up the passage. Surge pushes through the tube on bigger days, which is how it earned the nickname Suck 'Em Up, so it's an easy Open Water dive in calm conditions and a more thoughtful one when the swell is running. The exit cavern is nicknamed Skull Cave. Look for whitetip reef sharks and green turtles resting inside.

Depth: 10–60 ft (3–18 m) | Level: All Levels (Advanced recommended in surge)

Golden Arches (Kaiwi Point)

One of the best lava-arch dives on the whole Kona coast. Golden Arches has a big primary arch, a smaller secondary one, and a drop-off, all draped in coral and patrolled by yellow tangs and triggerfish. Dive it with the neighboring Kaiwi Point and you add large coral mounds, a lava wall, and a carousel-shaped cavern. The point can pick up moderate current, which is exactly what brings passing mantas and the occasional shark cruising through the blue.

Depth: 40–80 ft (12–24 m) | Level: All Levels

Turtle Pinnacle

Kona's most reliable turtle dive, and a great, relaxed second dive. Green sea turtles hover over the coral heads here while surgeonfish and tangs pick algae off their shells at a natural cleaning station. It's shallow, gentle, and predictable in the best way, so it's a favorite for photographers who want unhurried time with honu. Keep your distance and let the turtles come to you, since they're protected under federal law.

Depth: 20–60 ft (6–18 m) | Level: All Levels

Au Au Crater (Pelagic Magic Blackwater Dive)

Kona's wildest dive and a genuine bucket-list night for underwater photographers. A few miles offshore, over water thousands of feet deep, you clip onto a tethered line under the boat and hang in the top 50 ft (15 m) while the ocean's deep-scattering layer rises in the dark. What drifts past is unlike anything on the reef: transparent squid, larval fish, siphonophores, comb jellies, and pelagic octopus, with the occasional larger animal passing at the edge of your light. It demands solid buoyancy control, so operators run it for certified divers only in small groups of six.

Depth: 0–50 ft (0–15 m) over open ocean | Level: Advanced

Explore Interactive Map

Explore more dive sites with Divearoo's Dive Site Explorer.

Best time to dive Kona

The best time to dive Kona is honestly any month, since the leeward coast stays diveable all year, but what you're chasing shifts the calendar. Summer, roughly May through September, brings the warmest water, the calmest seas, and the strongest plankton blooms, which means peak manta activity, especially around the new moon. Winter, November through April, cools the water to around 75 °F (24 °C) but fills it with humpback whale song and stays excellent on this sheltered side of the island. Locals point to September and January as quieter, less-crowded windows.

Diving conditions

Diving conditions in Kona are about as forgiving as Hawaii gets, thanks to the volcano wind-shadow that keeps the leeward coast calm. Currents are generally gentle, picking up to moderate only at exposed points like Kaiwi and on the open-ocean blackwater drift. Thermoclines are mild and mostly noticed on deeper dives past 100 ft (30 m).

Marine life in Kona

Marine life in Kona is defined by big-animal reliability and Hawaiian endemism. More than 20% of the reef fish here live nowhere else on Earth, so alongside the headline mantas and turtles you'll see endemics like the kole tang, Potter's angelfish, and saddle wrasse on nearly every dive. Hawaii was the first US state to protect manta rays, back in 2009, and Kona's resident population is one of the best-studied in the world.

Reef manta ray (Mobula alfredi): year-round, especially the night dive at Garden Eel Cove

Kona hosts 450+ individually identified resident mantas, and the light-and-plankton night dive is one of the most reliable manta encounters anywhere.

Hawaiian green sea turtle (Chelonia mydas): year-round, especially Turtle Pinnacle

Resting on ledges and lining up at cleaning stations, protected under federal law so keep your distance.

Humpback whale (Megaptera novaeangliae): November to May

You rarely see them on the reef, but their song fills the water all winter, peaking January to March.

• Whitetip reef shark (Triaenodon obesus): year-round, resting under ledges and inside the lava tubes and caverns by day, harmless and photogenic.
• Endemic reef fish: saddle wrasse, Potter's angelfish, and Hawaiian dascyllus on every dive, a big share of what you see and found only in Hawaiian waters.
• Pelagic and larval life: transparent squid, siphonophores, and pelagic octopus that rise from the deep after dark on the blackwater dive.

Discover more marine life on Divearoo's global heatmap.

Marine conservation

Kona's mantas are the reason Hawaii became the first US state to protect manta rays, banning the intentional killing or capture of them in state waters in 2009. The resident population is one of the best studied anywhere, with more than 450 individuals catalogued by the unique spot patterns on their bellies, and photos from the night dive regularly feed those ID databases. The reefs themselves are under real pressure: the 2015 bleaching event killed a large share of the coral on West Hawaii reefs, and the global bleaching that ran through 2023 to 2025 reached them again. Kealakekua Bay is a Marine Life Conservation District with no-take rules, oxybenzone and octinoxate sunscreens are banned statewide, and manta operators enforce a strict no-touch policy, since a hand on a manta strips the mucus layer that protects it from infection. Read more about Divearoo's Conservation First policies

Practical information

Dive prices

• Two-tank boat dive: $169–229 for a standard morning charter out of Honokohau Harbor
• Manta ray night dive: $130–260 depending on whether you scuba or snorkel, usually run as a two-tank dusk-and-dark trip
• Pelagic Magic blackwater dive: around $230 for a single tank, small groups of six
• Gear and tax: typically extra, so confirm whether your quote is all-in

Getting there

Fly into Kona International Airport at Keāhole (KOA), about 10 to 15 minutes from Kailua-Kona town and Honokohau Harbor, where nearly all dive boats depart. Deep water sits close to shore, so most sites are a 10 to 30 minute ride. There's no recompression chamber on the Big Island, so any serious dive injury means stabilizing on oxygen and air-evacuating to the state's chamber on Oahu. Dive conservative profiles and carry DAN insurance.