The 19-year-old left Squires, Market Street, Preston, and walked along Cheapside onto Church Street, when she was approached by two men who walked alongside her to Deepdale Road, Preston.
After turning onto Blackpool Road the men grabbed the girl and dragged her into the town's Moor Park where she was sexually assaulted before her attackers made their getaway along Deepdale Road and St Stephen's Road.
The two men were dark skinned, possibly Asian or Mediterranean, and would have had muddy clothes after the incident.
People with information should call Crimestoppers on 0800 555 111 or Preston police on 01772 203203.
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