Fires lit in early December to burn forestry slash have flared up again in the Waiouru-Ohakune area, spurred by easterly winds and hot dry conditions.
Firefighters spent the weekend battling two vegetation fires near State Highway 49 and Tangiwai.
Both originated from the burning of slash (forestry prunings), senior Ohakune volunteer firefighter Marty Webb said.
"With the weather and wind that we have had, and the heat, those fires have never gone out."
The fires would have been sheltered from the predominant northwest wind, but a breeze from the east on Saturday made them flare up. Both were fought by Waiouru fire crews.