Police were called to the Rathburn Road and Renforth Drive area around 5 a.m. after a man allegedly reached through a ground-floor window and groped a woman.
The suspect fled after she escaped his grip and screamed. K-9 units searched the area, but the suspect remains at large.
The man did not enter the home and the woman was unhurt.
Police described the suspect as having a tanned complexion, aged between late 20s to mid-30s, approximately six feet tall, between 160-180 pounds and unshaven with dark short hair, dark eyebrows and dark eyes. He was wearing a blue/black plaid short-sleeve shirt and light-coloured shorts
They are urging anyone with information to contact police at 416-808-7474, or Crime Stoppers anonymously at 416-222-TIPS (8477).