Glowworm Cave

Not Worms, Not Stars, But Something Stranger

The blue-green lights covering the ceilings of New Zealand’s glowworm caves are not bioluminescent worms. They are the larval stage of a fungus gnat called Arachnocampa luminosa, a species endemic to New Zealand and found nowhere else on earth. Each larva attaches to the cave ceiling and produces up to 70 sticky silk threads that hang below it like a bead curtain. The light attracts flying insects, which collide with the threads and are consumed. The larvae glow more brightly when hungry. The effect of thousands of them overhead is that of a dense, slow-moving field of blue stars, and knowing what is actually producing it does not reduce the strangeness of it at all.

There are several glowworm caves open to visitors in New Zealand. The two most significant are Waitomo Caves in the Waikato region of the North Island and the Te Anau Glowworm Caves on the South Island. They differ considerably in what they offer.

Waitomo Glowworm Caves: North Island

Waitomo Caves, about three hours south of Auckland and 80 kilometres from Rotorua, holds the most visited glowworm cave in the country. The standard Glowworm Cave tour (45 minutes, adult ticket NZD 61 in 2026) takes groups through the cave system by foot and finishes with a short boat ride under a ceiling dense with larvae. Tours run every 30 minutes from 9am to 5pm daily, and the site is cashless, so payment must be arranged in advance.

Booking ahead is essential during the October to April peak season. The tour does not require physical fitness beyond basic walking. Photography of the glowworm section is difficult and largely prohibited to protect the larvae from flash disturbance.

The more interesting option for able-bodied visitors is the Black Water Rafting. The Black Labyrinth tour (around 3 hours) involves putting on a wetsuit, sitting in an inner tube, and floating through Ruakuri Cave in the dark, looking up at the glowworm display. The cave interior stays at 12 to 14 degrees year-round regardless of outside temperature. A headlamp jump into a dark underground waterfall is part of the experience. The Black Abyss option (5 hours) adds abseiling. Both require advance booking; small group sizes mean they sell out quickly during peak periods.

Ruakuri Cave is separately accessible as a walking tour (adult NZD 75 approximately) and is the better cave for those who want to see glowworms without the boat crowd, with the added benefit of extensive limestone formations. It is also the only one of the three Waitomo caves that is wheelchair accessible. The third cave, Aranui, contains no glowworms but has outstanding stalactite and stalagmite formations.

Combo tickets covering two or three caves save meaningfully over individual entry prices. The Twin Cave Combo (Glowworm Cave and Ruakuri) costs around NZD 98 per adult.

Te Anau Glowworm Caves: South Island

The Te Anau Glowworm Caves sit within Fiordland National Park and involve a water crossing of Lake Te Anau before you reach the cave entrance. Real NZ (formerly RealJourneys) operates the tours; access is strictly by guided group only and the departure is from Te Anau township. The cave was re-discovered in 1948 (Maori had known of it earlier), and its geology includes active water carving, with an underground stream still actively shaping the passages.

The glowworm population here is substantial and the setting, reached by boat across one of New Zealand’s largest lakes with Fiordland peaks visible on arrival, is more dramatic than Waitomo’s land-based approach. The tour is quieter and has a more remote feel, although it is still a guided group experience.

Te Anau is the gateway town for Milford Sound (about 120 kilometres north) and Doubtful Sound, making it a natural base for several days of Fiordland exploration rather than a standalone day trip.

Where to Eat

In Waitomo, the cave operator’s own café handles most visitor food needs, which is a polite way of saying that dining options near the caves are limited. Hamilton (45 minutes north) has a broader restaurant scene.

Te Anau township has a small but adequate restaurant strip along Lake Front Drive. Mainly Seafood serves straightforward fish and seafood appropriate to the location. The Blue Duck Cafe is well-regarded for breakfast and lunch. Supplies and grocery shopping for self-catered accommodation are easy in Te Anau town.

Where to Stay

Near Waitomo, Waitomo Caves Guest Lodge and smaller BandB options offer local accommodation. Most visitors doing a day trip from Auckland or Rotorua do not stay overnight, which means the area is relatively quiet in the evenings.

In Te Anau, the Distinction Te Anau Hotel and Villas is the most comfortable option at mid-to-high price point. The town has numerous motel and holiday park options covering all budgets, and self-contained accommodation is practical for families. Booking well ahead is advisable from December through February.

Getting There

Waitomo is reached by car on SH3 from Hamilton (45 minutes) or from Rotorua (90 minutes via Tirau). There is a shuttle from both Hamilton and Rotorua; Intercity buses also serve the route. From Auckland, allow 2.5 to 3 hours by car.

Te Anau is 2.5 hours by road from Queenstown or Invercargill. Queenstown Airport is the nearest significant air hub; Invercargill also has flights. Rental cars are the practical transport option once you are in Fiordland.

Practical Notes

Wear layers regardless of the season; both cave systems maintain temperatures well below ambient outdoor temperature during summer. Closed shoes are required at both sites.

One detail most visitors miss about the glowworm biology: the adult fly lives for only a few days, long enough to mate and lay eggs, during which time it does not eat because it has no functional mouthparts. The entire species’ nutrition is secured entirely in the larval stage, which can last six to twelve months. The adult glowworm does not glow. The light comes only from the hungry larva overhead.