Ardern said Governor-General Dame Patsy Reddy would give the traditional Speech from the Throne on Wednesday, which takes place as part of the formal state opening of Parliament.
"The Speech from the Throne will set out our vision for a fairer, better New Zealand and the measures we intend to introduce over the next three years to achieve that," Ardern said.
On Tuesday the commission opening at Parliament will take place so MPs can be sworn in and a Speaker elected. That is likely to be Labour MP Trevor Mallard. The formal state opening will take place on Wednesday.
National MPs will take up their new positions on the Opposition benches. Leader Bill English says his team will be the strongest opposition New Zealand has seen.