Auckland firefighters have contained a big scrub fire on Mount Wellington and another on Mount Eden.
There were 55 fireworks-related blazes from Auckland to Northland last night, Fire and Emergency says.
Smoke from the Mount Eden fire spread over the Auckland CBD before midnight.
One man, Ben Hocking, watched that fire rage after going up Mount Hobson - just east of Mount Eden - to watch fireworks with friends.
Fire and Emergency says the Mt Wellington fire started just before 10pm burned an area of scrub about 200 metres by 100.
Seven appliances, a water tanker and crews battled the blaze, which was finally put out at about 2am.
A fire in the crater on Mt Eden just after 10pm was also extinguished.
Fire and Emergency says the call centre was very busy until midnight but calls dropped off after that.
In the lower North Island, Fire and Emergency said nine vegetation fires were sparked by fireworks.
Shift commander Murray Dunbar said none of them were major, but they did create a moderate workload for the firefighters.
The largest blaze - about 70 metres by 50 - was in suburban Palmerston North. There were also fires in Island Bay and Moa Point on Wellington's south coast.
There were just eight fires in the South Island, all in Christchurch.
Southern shift commander Andrew Norris said the largest - in Parklands - destroyed about 50 metres of a macrocarpa hedge separating the Waitikiri Golf Course and nearby houses.
It took four fire engines a couple of hours to extinguish the blaze.
Mr Norris said the other fires were in bushes and toitoi.
He said the low number of callouts was testament to the overall good behaviour in the South Island, with people in dry areas such as Central Otago extremely vigilant for fire.