The 19-year-old victim was walking in the 4900 block of Ziegler Road around 1 a.m. on Saturday, Dec. 22.
She told police an unknown man approached her, pushed her to the ground, and sexually assaulted her.
The suspect is described as a white male, 20-30 years old, approximately 6' tall, 180-200 lbs., with brown hair, brown eyes and wearing a dark hooded jacket, red shirt, gray beanie, with some stubble on his face.
Anyone who may have been in the area and have knowledge of the incident or of the suspect is asked to call Detective S. Jungmeyer at (970) 416-2195 or Crime Stoppers of Larimer County at (970) 221-6868.
Crime Stoppers may also be reached through their web site at www.stopcriminals.org.
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