Best Time to Visit Waitomo Caves: Time of Day, Seasons & Rain

Waitomo's cave tours run year-round and the glowworms glow in every season, so once your dates are fixed, the time of day you book usually matters more than the month.

This guide compares the seasons for crowds, rain and the glowworm display. Use the date checker to see the rain forecast, temperature and sunset for your exact day.

Choosing a Tour Time

The Glowworm Cave is open from 9am to 5pm every day, with tours leaving regularly through the day, and the operator says pre-booking is essential in every season. Ruakuri runs fixed departures from about 10am, with the last at 3:30pm. Allow about 45 minutes for the Glowworm Cave and up to two hours for Ruakuri, plus check-in, if you combine them.

Large tour groups mostly arrive between about 10:30am and 2:30pm, according to Lonely Planet, and older visitor-timing data for the cave puts the peak in the same part of the day. If you are staying in or near Waitomo, the first tour of the morning avoids that window. A late-afternoon tour works too, and suits a drive in from Rotorua, Hamilton or Taupo. On a coach day trip, the tour sets the time. For detailed timings, see Waitomo opening hours and tour times.

The air in the cave is monitored for carbon dioxide from visitors’ breath, and tours pause when it gets too high. In one summer the operator told RNZ the cave had closed about five times for this, each time for between half an hour and a few hours. That is another reason to avoid the middle of a summer day.

The glowworms have a daily cycle of their own and are brightest in the evening: around 5pm in early spring and about 8pm in summer, at or after closing time. Visitors have a small effect on the display, mostly at the start and end of the day, at a level the researcher judged probably too small to notice by eye. Pick the tour time to avoid the crowds.

After dark, the free Ruakuri Walk is another way to see glowworms. The Department of Conservation says they can be seen on the track at night, best beside the main bridge. Take a flashlight and dim it when you stop. In winter it is dark by early evening; in summer it stays light until late, so the walk means a late night.

Aranui Cave, right now

Aranui Cave was closed for maintenance, with a planned reopening on September 14, 2026. When we checked on October 6, 2026, the operator’s Aranui page still showed it as closed and it could not be booked. The Glowworm Cave and Ruakuri were running as normal.

Other experiences you might enjoy

If you are planning the rest of a North Island trip, you can combine a Waitomo cave tour with Hobbiton near Matamata, the geothermal parks of Rotorua or the Otorohanga Kiwi House. The tours below cover those and other nearby experiences.

How the Seasons Compare

If Waitomo is one stop on a North Island trip or a day out from Auckland, choose the season for the whole trip. The cave tours run in every month.

December to March. The busy season at the caves, along with the summer school holidays. January to March is the warmest and driest stretch at nearby Te Kuiti, with average highs of 23 to 25°C and 76 to 84 mm of rain a month; December is warm but wetter, at about 129 mm. December and January have the latest sunsets, so the free night walk starts late. In 2025, overnight stays in Waitomo District were between 12,500 and 15,800 a month over these four months. Book ahead and choose an early or late tour.

April. Cooler than March, with the autumn school holidays. Overnight stays drop from the summer level, so Waitomo is usually less busy than in March.

May to August. The cave tours run the same way underground, and the early dark makes the free night walk easy to fit in. Above ground this is the wettest time, and June to August are the coolest months: July averages 174 mm of rain at Te Kuiti and a high of 13.6°C. That is the total for the whole month, so it does not say how many days are wet; at Hamilton, the nearest station with a published count, July averages about 13 days with 1 mm or more of rain, against about 6 in February. From March to August, fog forms in the King Country valleys on some clear, still mornings, so allow extra time for a first tour. In 2025 these were the four months with the fewest overnight stays in Waitomo District, between 5,600 and 6,400 a month, less than half the January figure. An older Department of Conservation visitor survey found crowding in the cave a problem in summer but not in winter.

September to November. In most years the glowworms build through spring. September is still wet, and the spring school holidays run from late September into October. November is warmer and comes before the December-to-March busy season, although overnight stays in November 2025 were already close to the February and March levels.

The Glowworm Display Through the Year

In the Glowworm Cave, the glowworms are on show all year. In most years they are fewest in winter, build through spring and give the brightest display through summer, and in some years there is no clear summer peak. The long-term record also shows signs of a three- to four-year cycle on top of the seasonal one.

In the most recent full year of monitoring, 2024–25, numbers rose quickly from mid-August to early September, the count stayed high until mid-November, and the display was brightest in November and December. The winter count is lower but stable, so a July visitor still sees the grotto lit up. The likely driver of the cycle is the supply of small insects, mostly non-biting midges, that emerge from the Waitomo stream and feed the glowworms. More on how they glow in what are glowworms.

Rain, Flooding and River Trips

The Waitomo stream runs through the caves, so heavy rain is the weather that matters. The operator says the Glowworm Cave is affected only by heavy rain over an extended period. The boat ride is on the stream inside the cave, so wind and waves play no part; rain matters when it raises the stream. On an ordinary wet day it is a good choice. For Ruakuri, the operator says heavy rain can make walkways slippery or impassable, and tours may be rescheduled or cancelled.

River trips are more sensitive. Legendary Black Water Rafting says its tours run rain or shine, and Kiwi Cave Rafting cancels only in very heavy rain. Waitomo Adventures says its all-day Lost World Epic is sometimes closed by flooding, when it switches to other trips, and that its other trips rarely close. If rafting matters to you, check the rain for 3 days, your date and the two days before, and keep a spare day in your plans. See black water rafting in Waitomo.

Rain can also affect the drive. Floods in January 2023 closed State Highway 37, the road into Waitomo, for four days, so after heavy rain check the council’s road status page before you set out.

The caves are cool in every season. On a rainy day, bring a rain jacket for the walk in as well as a warm layer.

Waitomo Month by Month

Temperatures and rain are averages for Te Kuiti, about 15 km from Waitomo; the hills around the caves get more rain. Sunset is calculated for Waitomo in the middle of each month and decides when the free Ruakuri Walk glowworms show; the cave tours themselves are underground. Overnight stays are for Waitomo District.

How We Know

Opening times, booking, rain and busy season. Discover Waitomo’s own pages give the Glowworm Cave’s daily 9am to 5pm opening, “Pre-Booking is Essential”, the 45-minute tour, the heavy-rain wording, Ruakuri’s flooding wording and the December-to-March busy season. Its terms say Ruakuri closes on December 25 and all its other experiences are open every day of the year; Legendary Black Water Rafting’s pages say it is open 364 days a year and closed on Christmas Day. The operator’s pages give different cave temperatures, from 12–14°C to 16–17°C, which is why we say cool rather than quote one. Rafting and caving wording is from Legendary Black Water Rafting, Kiwi Cave Rafting and Waitomo Adventures. Checked September 19, 2026; we plan to recheck Aranui Cave’s status by October 19, 2026.

Time of day. The 10:30am to 2:30pm window for large tour groups is Lonely Planet’s. The older visitor-timing data is NIWA’s 1996 figures for the cave, cited in Doorne (1999), Visitor experience at the Waitomo Glowworm Cave, Department of Conservation Science for Conservation 95, which puts the bulk of visitors between 11am and 2pm. The same report’s surveys in January and June 1998 found 45% of summer visitors were not satisfied with the number of groups in the cave, and concluded that crowding was a problem in summer but not in winter; the surveys predate online timed booking. Britz, a campervan brand in the same group as the operator, also recommends the first or last tours. The carbon dioxide closures are from RNZ (January 25, 2017), quoting the operator’s chief executive. The night walk is from the Department of Conservation’s Ruakuri Walk page.

Glowworms. Merritt, D.J. (2024), Austral Entomology 63: 379–392, on 13 years of photo monitoring in the Glowworm Cave, and Merritt, D.J. (2026), Wildlife Research 53, WR25139, on a year of monitoring in 2024–25. The “most years” pattern is from the first paper; the monthly detail is from the second, which covers one year. Neither paper gives a size for the difference between the winter low and the summer high, so we do not either.

Climate. Monthly temperature and rain are the 1991–2020 normals for the Te Kuiti EWS station from NIWA’s climate database, read from a published reproduction because the database itself needs a licence. The annual total matches NIWA’s own published 1981–2010 figure for Te Kuiti within about 2%, and individual months within about 16%, with the same seasonal shape. Wet-day counts are NIWA’s published 1991–2020 normals for Hamilton (Ruakura 2 EWS), because no count is published for Te Kuiti. NIWA’s The climate and weather of Waikato notes more than 2,000 mm a year in the hill country west of Te Kuiti, where Waitomo is, about 28 fog days a year at Te Kuiti, and that fog is most frequent from March to August. Sunset is calculated for Waitomo Caves village, not observed.

Crowds. Monthly overnight stays (guest nights) in Waitomo District for 2025 are from the Accommodation Data Programme, which surveys 16 to 17 commercial providers with six or more units. The State Highway 37 closure in January 2023 is from RNZ (July 2023). School holidays are from the New Zealand Gazette.

Where the evidence stops. We found no published monthly or hourly count of people in the caves, so the crowd figures are a proxy and the time-of-day advice rests on a guidebook and older visitor studies. The overnight-stay series does not count people in the caves or coach day-trippers, and the survey rates its own Waitomo figures as low or medium quality, so small month-to-month differences are not meaningful. The averages are for Te Kuiti, which is drier than the hills at Waitomo, and an average is not a forecast. The glowworm month detail is one year’s data. None of the operators we checked publishes how often rain cancels a tour. The forecast in the date checker comes from Open-Meteo; beyond its range, the card shows averages.

Frequently Asked Questions