The schoolgirl was walking close to the Mile House pub in Stockton when she was approached by a stranger.
She was then followed towards Sheraton Park where she was dragged into a secluded area and raped.
The girl and her family are currently being supported by specialist officers.
Cops are now urgently hunting the fiend following the horror between 5.30pm and 7.45pm on November 15 last year.
He has been described as black, aged in his 20s, around 6ft tall and of muscular build with a local Stockton accent.
The suspect was wearing tight black jeans which were ripped at the knees and a dark coloured top and baseball cap.
Officers are appealing for any motorists in the area at the time who may have dashcam footage.
A spokesperson for Cleveland Police said: "The incident occurred between 5:30pm and 7:45pm when a 12-year-old girl was approached by an unknown man at the traffic lights on Durham Road opposite the Mile House pub.
"The man then followed the girl along Darlington Lane towards Sheraton Park where she was subsequently raped in a secluded area.
"Any witnesses or anyone with information is asked to contact DC Lindsay Davidson from Cleveland Police on 101 quoting event number 017514.
"Crimestoppers anonymously can be contacted on 0800 555 111 or via www.crimestoppers-uk.org."
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