Selwyn District Council said 12 fire appliances and about 70 firefighters were at the fire. Five helicopters were either at the scene or on the way.
An incident command point is operating near the fire and there are some road closures in place nearby.
"Due to the significant strong nor'west wind conditions it is difficult for the Fire Service to control currently," the council said.
"Anyone near this location who is asked to leave their property by police or fire services should follow their instructions."
Fire Service shift manager Brent Dunn said fire crews have also been battling fires in Selwyn, Ashburton and South Canterbury.
-additional reporting Emily Murphy, Newstalk ZB