Around 30 firefighters and three helicopters are battling a scrub fire in Titoki, west of Whangarei.
The blaze covers 15ha.
Another helicopter and ground crews are protecting a nearby structure, that's endangered by the flames.
A resident on the corner of Wright Rd and McCardle Rd said she could see a massive cloud of smoke.
"There is a big, huge cloud of brown smoke. I have been in town today and could see it from the main road, Mangakahia Rd. It is massive.
"There is a helicopter working on it and I have seen two fire engines go up."
She said the area was very rural, with big farms and areas of native bush.
There are about 10 properties on Wright Rd.
"It looks to be at the back of someone's property," she said.
"All I can see is trees with this big bloom of smoke coming up above them."