A grassfire burning across multiple suburbs on Melbourne’s north-western fringe is growing quickly after a wind change.

The emergency-level blaze near Sunbury, around 40 kilometres from the CBD, has already burned through more than 250 hectares.

Residents in Beveridge, Bolinda, Clarkefield, Darraweit Guim, Mickleham, Oaklands Junction, Sunbury and Wildwood have been told it is too late to leave and to take shelter immediately.

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Grass fire in ClarkefieldResidents in Clarkefield, Bolinda and Darraweit Gum have been told to take shelter. (VicEmergency)

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“The safest option is to take shelter indoors immediately. Do not get in the car and drive,” a VicEmergency warning states.

“It is safer to stay where you are.”

The CFA said it was aware of reports of a caravan ablaze near the fireground.

A recent wind change has shifted the flames in a north-easterly direction towards Old Sydney Road, Mickleham.

Footage of the fire from above released by Emergency Vic. (Facebook)

“If you are in Mickleham on Donnybrook Road or Mandalay Estate, Beveridge be prepared to walk two streets back,” the CFA advised.

An earlier warning noted the fire was travelling in an easterly direction towards Boggy Rate Road.

Authorities are concerned an imminent wind change could worsen conditions.

Multiple firetrucks are responding to the grass fire, along with water aircraft.

More to come.

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