Bluff tide times

Bluff is as far south as New Zealand's road network goes. State Highway 1 ends here — 2,000 kilometres from Cape Reinga — at the waterfront of a working port facing Foveaux Strait. The signpost at Stirling Point gives the distances to the South Pole and to Edinburgh, which in this context feels accurate rather than touristy. The wind off the strait in winter is the kind that makes those distances believable.

Tidal range at Bluff is approximately 2.5 metres mean spring range (LAT datum, LINZ). The strait behind the breakwater is exposed and fast: spring tidal streams run 3 to 4 knots through the 40-kilometre channel between here and Stewart Island. The Bluff–Oban (Half Moon Bay) passenger ferry operates the crossing in roughly one hour when sea conditions permit; swell from the southwest can delay or cancel sailings at short notice. For the ferry schedule, check conditions on the day — the crossing is spectacular in good weather and genuinely rough in bad.

Bluff's reason for existing commercially is the port. The Tiwai Point aluminium smelter, 20 kilometres north on the peninsula, uses the deep berths here; log exports go from the same quays. But the cultural identity of Bluff is the Bluff oyster: Ostrea chilensis, the flat southern oyster, harvested from the beds in Foveaux Strait from April through August. The season opens in late April and the Bluff Oyster and Food Festival in May draws several thousand visitors. The oysters are filter feeders, and the cold, plankton-rich current that Foveaux Strait channels year-round is the growing medium. The tidal vigour of the strait — those 3-to-4 knot streams — is directly responsible for the food concentration that makes the oysters what they are.

Stirling Point, at the road's end, has direct views across the strait on clear days — you can see the outline of Stewart Island from the breakwater. The Bluff Hill lookout above the town gives the full geographic picture: port, strait, and the Southern Ocean horizon beyond.

Predictions on this page come from Open-Meteo Marine, a global gridded ocean model accurate to within approximately ±45 minutes on timing and ±0.2–0.3 metres on height. For authoritative New Zealand tidal predictions, consult Land Information New Zealand (LINZ) at linz.govt.nz.