National Parks area manager Michael Lieberman said parks had been badly damaged by the Wallangarra fire which burnt across national park, state forest and private property last month.

The fire destroyed 29,000 hectares of bushland and forced the evacuation of homes across the Tenterfield and southern Queensland area last month.

The fire started in Queensland and the cause is as of yet unknown. There was also a fire at Tabulam.

Mr Lieberman said the Bald Rock, Boonoo Boonoo and Basket Swamp National parks would "remain closed for the foreseeable future" while they made the parks safe and repaired their ecology.

“There is a real risk to the public from damaged trees falling and it is extremely important that people stay away, taking note of barriers and warning signs," he said.

“We will also need to assess damage to visitor infrastructure including walking tracks, bridges, lookouts and signage.

“A post fire landscape is very vulnerable to disturbances and erosion can further impact the fragile environment as the vegetation starts to recover."

He said that Australian native animals and plants are adapted to fire.

The department had yet to assess the impact of the fire, but said it is likely that the park will take some time to recover.

“We are asking for people to be patient while we assess, rebuild and make the park safe and encourage people to checkwww.nationalparks.nsw.gov.au for updates on when visitor areas are reopened before visiting the area,” he said.