Hamilton city, Huntly, Raglan, Te Kauwhata, Ngaruawahia will go into alert level 3 for five days from 11.59pm tonight.
Prime Minister Jacinda Ardern said the region going into level 3 will allow health officials to do widespread testing, contact tracing, and wastewater testing.
Anyone with symptoms should get tested, and a further decision will be made in five days' time.
The alert level change comes after two new positive Covid cases were reported in Raglan and Hamilton this morning.
The two cases are connected to each other but not linked to the Auckland outbreak at this stage.