Southern Sky Notes

Notes · Dark skies

Where to Go Stargazing in the South Island

The South Island has the country's best-known dark skies and, more importantly, a lot of very dark country between the famous spots. Low population, high inland basins and dry rain-shadow air make for nights that are hard to match anywhere. This guide runs roughly north to south. For the North Island, see our earlier post on the best stargazing spots in the North Island, and for the formal reserves and sanctuaries, our overview of dark sky places in New Zealand.

Wai-iti Dark Sky Park, near Nelson

The Wai-iti Recreation Reserve near Wakefield became an International Dark Sky Park in 2020, the first in New Zealand. It is a small, easily reached site, which is its strength: Nelson and Tasman residents can be under a properly dark sky within half an hour of town. The northern part of the island is also one of the sunnier parts of the country, so clear nights are relatively frequent.

Takapō/Tekapo and Mt John

The heart of the Aoraki Mackenzie International Dark Sky Reserve, established in 2012. The Mackenzie Basin sits high and dry in the lee of the Southern Alps, and the townships have long kept their lighting controlled.

Mt John, above the lake, is home to the University of Canterbury's observatory. Public tours are run by the Dark Sky Project, and they are a good introduction if you are new to the southern sky. If you prefer to observe on your own, almost any lay-by or lakeshore away from the township's lights is dark enough for the winter Milky Way to look almost three-dimensional on a moonless night.

Practical notes:

  • Nights are cold at any time of year. In winter, expect frosts well below zero and ice on roads.
  • Pull well off the road when stopping. State Highway 8 carries trucks and tourist traffic at night.
  • The township is busy in peak season. Book accommodation ahead.

Aoraki/Mt Cook

Further up the basin, Aoraki/Mt Cook village is ringed by high mountains, so the horizon is not open, but the sky overhead is superb. The Aoraki/Mount Cook National Park page on the DOC website covers access, huts and conditions. The Hooker Valley and Tasman Valley areas give a little more sky than the village itself.

Mountain weather changes fast. Even on a clear evening, cloud can pour over the main divide within an hour, and the nor'west wind can be ferocious.

Central Otago

Less publicised but just as dark in many places. The Maniototo, the Ida Valley, the area around St Bathans and Naseby, and the high country off the Danseys Pass road all sit far from large towns. Central Otago has the most continental climate in New Zealand: hot dry summers, very cold clear winters, and some of the lowest cloud cover in the country. Dry air also means less dew on optics.

Winter inversions can bring thick fog to the valley floors around Alexandra and Cromwell. Getting a little height often puts you above it.

Rakiura Stewart Island

The Rakiura Dark Sky Sanctuary, recognised in 2019, is one of the best places in the country to see the aurora australis because of its southern latitude. The island is small and lightly populated, and most of it is national park. The sky to the south is open ocean.

The catch is weather. Rakiura is often cloudy and wet, and the ferry crossing of Foveaux Strait can be rough. Allow several nights if you go with a specific aim, and check the forecast closely.

The Catlins

The Catlins coast between Balclutha and Invercargill is thinly populated, faces south over the Southern Ocean and is a favourite with aurora photographers. Places such as Nugget Point, Curio Bay and the many small beaches give dark southern horizons.

Like Rakiura, it is exposed to southerly weather and sea fog, and gravel roads at night need care. Some headlands have cliff edges with no barriers.

The West Coast caveat

The West Coast has dark skies, with few towns and a long ocean horizon to the west, but it is one of the wettest regions in the country. When it is clear, often after a southerly change, the transparency can be outstanding. Treat it as an opportunistic destination rather than one to plan a trip around, and keep sandflies in mind at dusk.

Planning tips for any South Island site

  • Moon phase. Plan around the new moon if the Milky Way or faint objects are the goal.
  • Season. Winter gives long nights and the galactic centre high overhead, but cold and ice. Summer nights in the far south are short; full darkness may not arrive until after 11 pm with daylight saving.
  • Cloud forecasts. Check MetService rural forecasts for the specific area, not just the nearest city.
  • Safety. Tell someone where you are going. Mobile coverage is patchy in much of the backcountry. Carry warm layers even in summer.
  • Respect. Many good spots are on private land or conservation land. Stay on public roads and reserves unless you have permission, and keep headlights and torches off when others are observing.

The South Island's real gift is not any one site but the sheer amount of dark country. With a map, a clear forecast and a willingness to drive half an hour past the last town, you will find your own favourite.