Shortly after 7 a.m., police say a man approached the 26-year-old victim from behind and sexually assaulted her.
The suspect fled the scene. He is described as a white male of Asian descent, who is approximately 5'7" and 25 years of age. He wore a black tuque, black pants, a grey, hooded sweater and a black, sleeveless, puffy vest.
Anyone with information is asked to contact investigators at 416-808-7474.
Members of the public can also pass on information anonymously through Crime Stoppers at 416-222-8477.