Firefighters are confident that a grass fire which started on 7 January and has burned 220 hectares of land west near Mialla Road east of Balladoran is now under control.

A spokesperson for the NSW Rural Fire Service (RFS) told the Western Plains App the fire had burned through both private land and national park, but that no houses were under threat.

Two Gilgandra crews assisted NPWS (National Parks & Wildlife Service) and other NSWRFS crews from Castlereagh Zone and Orana at this fire which kept firefighters busy for around 48 hours, supported by Large Air Tanker 166 from Dubbo.

Aircraft had been called in to help dozens of fire fighters because fire trucks were unable to access some of the areas fire when trying build containment lines.

"We often see problems with access in fires across regional NSW," the spokesperson said.

The spokesperson told the Western Plains App said the fire originally started as three different fires before becoming a single Starrs Complex Fire. Causes for the fire are under investigation.

High fuel loads and poor access hindered ground control of the Starrs Complex Fire. IMAGE: Gilgandra RFS

Western Plains residents have already been given warnings about "deadly grassfires" this season.

Earlier this month the NSW Rural Fire Service Commissioner Rob Rogers issued a warning that flood affected areas now drying up faced an increased hazard of "deadly grassfires". 

He said that western NSW had a significant amount of fuel build up following heavy rains.

NPWS crews are currently monitoring the Starrs Complex Fire ground.

"What really concerns us ... is that we're going to get in the second half of January, really hot days and strong westerly winds," Mr Rogers said.

"If we get fire starting like that with the level of growth out there and that growth is drying out, then those fires on those days will have the potential to be really destructive."

While Mr Rogers says the bulk of NSW grassfires are started by lightning, machinery and motor vehicles, as well as cigarettes and small household burns are also a problem.

The fire commissioner has also warned that fuel is building up faster than average across the five million hectares burnt in NSW in the 2019/2020 fires.