It is known that kakapo used to live from the far north of the North Island to the south of the South Island; from near sea-level to near the tops of mountains; from flat land to very steep land; from dry areas to wet areas; in cold areas and hot areas; in forests and in shrubland and tussock grasslands. This is known because sub-fossil remains have been found, along with discoveries in Maori midden (kitchen waste-pile) sites.
These days, to think about habitat for kakapo means thinking about offshore islands – protected areas of natural vegetation free from introduced mammals. A refuge, and hard to visit.
If there are any kakapo left on the mainland of Aotearoa now – which is highly unlikely – they will be in the remotest corners of wilderness; in a place like Fiordland National Park, where the last captures on the mainland occurred.