Police are still looking for a stranger who sexually assaulted an elderly Queensland woman in her front yard.

Police have released a comfit image of man who is believed to have sexually assaulted an elderly woman in her front yard in north Queensland.

The stranger approached the woman outside her Mackay home and sexually assaulted her before running away about 7pm (AEST) on Monday.

The woman was treated in hospital.

Police were still looking for the man and released a comfit image of him on Tuesday afternoon.

He’s described as Caucasian in appearance, in his early 20s, of a slim build and has shoulder-length dark hair.

He was last seen wearing a dark shirt and dark pants.