All parts of the country at the Red level of the Covid-19 alert level system, other than Northland, will move to Orange at 11:59pm on December 30.
Auckland, Taupō, Rotorua, Kawerau, Whakatane, Ōpōtiki, Gisborne, Wairoa, Rangitikei, Whanganui and Ruapehu will join the rest of New Zealand at Orange on December 30.
This means vaccinated people will be able to attend large events, including new year's eve festivals, everywhere other than in Northland.
Cabinet made the decision on Monday on the back of Ministry of Health advice.
The settings will be reviewed again on January 17.
Prime Minister Jacinda Ardern said she would get an update on Omicron in early-January to ensure border settings appropriately factor in the risk associated with the new variant of Covid-19.
Border restrictions are due to start being relaxed from January 17, when vaccinated New Zealanders arriving from Australia will be allowed to self-isolate for seven days rather than go to managed isolation.
From February 14, the same rules are due to apply to New Zealanders arriving from other parts of the world, ahead of the border slowly reopening to foreigners from April 13.
See this story for more on the current plan for reopening the border, which might be up for review when more information about Omicron comes to hand.
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