National Parks and Wildlife Service Blue Mountains regional manager Geoff Luscombe told AAP the bush would start to bounce back soon.
"The bush pretty much knows how to look after itself; it has been doing this for thousands, millions of years," he said.
With a little bit of rain, a "green carpet" would emerge in burnt areas, providing food for animals that had been hiding.
Grass trees known as black boys would sprout new "heads of green hair" and metre-long spear-shaped flowers and wild flowers like the delicate white flannel flower would eventually follow.
The popular blue gum forest had escaped fire, while visitors curious to see the bush regenerate from fire could visit spots on the Bells Line of Road, Mr Luscombe said.
Also keen to get into the parks are volunteers with the wildlife rescue service WIRES.
Spokeswoman Carla Toyne says vets and members of the public have handed over a large number of flying foxes, birds and possums for care. But many are too badly burnt and must be euthanased.
She hopes the parks will soon be safe enough for volunteers to enter and find injured animals which found shelter or burrowed away from the flames.
A few Blue Mountains WIRES volunteers faced the double heartbreak of losing their homes and seeing the animals they love lose theirs, Ms Toyne said.
Yet some were already inquiring about wildlife caring again.
"They are amazing people ... they are going through something this severe and you just see their integrity," Ms Toyne said.
"They genuinely want to preserve the Australian species."
* National Parks visitors should check the website for information on possible fires and closures before leaving home this summer
* Donations to the WIRES bushfire appeal can be made online
- AAP
