Fire crews struggled to contain a blaze, believed to be started by fireworks, on Te Mata Peak last night.
Six fire appliances responded after the alarm was raised about 9pm.
It proved difficult for fire fighters to get to as the steep terrain prevented them from reaching the flames, rural fire Service deputy principal Gordon Foster said.
While it was not contained at 10pm last night, he was confident it would be extinguished before midnight.
"It's a case of waiting for it to come to us," he said.