The firefighter was taken to hospital after sustaining burns while battling the fire in Carwoola, Greg Allan from the Rural NSW Fire Service said.

It is believed up to 15 homes were lost in the fire that was described as extremely dangerous and had burned 1,400 hectares by 6pm, but Mr Allen could not yet confirm numbers.

"We won't get a full figure until building impact assessment teams on the ground have been able to conduct reports," Mr Allen said.

Mr Allen said 194 firefighters, 50 vehicles and at least 10 aircraft were working to establish containment lines on Friday but struggled in the face of 34-degree heat and winds of more than 30 kilometres an hour.

He said crews would remain on the ground overnight and try to control the fire before facing potentially worse conditions on Saturday.

"If it is not contained by tomorrow, higher temperatures will make it harder for firefighters to bring it under containment."

Firefighters told residents near Carwoola and Captains Flat it was too late to leave at about 3pm on Friday.

Time lapse of fire burning near Queanbeyan. Source: Facebook/ Bender Gregory.

The NSW RFS said residents in the area of Taliesin Road, Wanna Wanna Road, Widgiewa Road, Whiskers Creek Road, Douglas Close, O'Hanlon Place and Captains Flat Road should monitor conditions and be prepared to enact their bush fire survival plan.

Properties are under threat along Widgiewa Road and Whiskers Creek Road. 

Monitor the situation at www.rfs.nsw.gov.au

More to come.