A total of 12 fire trucks, tankers and specialist vehicles from crews from Napier, Hastings, Mahia, Nuhaka, Wairoa, Hastings, Bayview and Putorino attended the blaze.
Two helicopters also attended the fire on Wednesday.
A witness, who drove through the area at 3.45pm on Wednesday, said the flames were at that time visible from the road.
"The smoke was thick and the flames were quite high in the trees adjoining the old YMCA camp at that stage," she said.
"There were already two appliances attending the fire by that point.
"The camp is no longer used, but it was scary as there are a lot of very dry wild pines so could have very easily spread towards the residential properties that back onto the camp."
The Fire and Emergency spokeswoman said while they had a continued presence at the site, the fire was under control.