It may still be winter, but NSW Rural Fire Service (RFS) crews are already looking at current fire risks and aiming to mitigate them before the next bushfire danger period.

So far this year, Dubbo has had well above average rainfall with 513.0 millimetres recorded from January to July which is well above the median for this period of 320.2mm.

Mudgee's rainfall is also well above at 515.0mm, which is higher than the January to July median of 350.6mm.

The rain has meant that the two RFS zones now have the highest rating possible of grassland fuels at 5.25-6 tonnes per hectare.

These are average readings taken across the two zones and Orana RFS district officer Bron Waters said grass growth is "huge" compared to six months ago.

"In some areas it's five foot (1.52 metres) tall," she said.

"As it dries out there's an increased risk to us.

"They [grass fires] can travel a long distance in a short period of time."

Ms Waters said destocking of rural properties during the drought has also led to increased grass levels.

"There's now not a lot of stock to keep fuel levels down," she said.

Cudgegong RFS zone district manager Superintendent Troy Porter said the winter rain meant that firefighters have so far been unable to conduct planned hazard reduction burns.

If crews do get a spell of good weather, burns will take place at Kains Flat, Bocoble and Clandulla to reduce fuel loads before the bushfire danger period.

Supt Porter is worried about grass fires in the zone and said if falls every few weeks that this would help keep the fuel moist.

"This year the grass fires are going to be a concern, it's a very difficult picture to last year when we were worried about forest fires," he said.

"The position we're in this year is certainly better than what we were in last year."

The RFS released a video on Monday highlighting just how quickly a grass fire can travel, even when the height of the grass is low.

"It doesn't have to be shoulder high to be problematic," RFS Inspector Ben Shepherd said.

"We need property owners to slash and put fire breaks in and where you can remove the hazards."

Landholders planning to burn off on their property can now notify the RFS online which helps to prevent unnecessary emergency calls.

People are encouraged to review their Bushfire Survival Plan and to remember the safest option when there's a fire is to leave the area.