Paramedics say a 911 call came in reporting a boy found walking alone and under-dressed at 4:48 a.m. ET Friday near the east Ottawa intersection of Ogilvie and Blair roads.
The paramedics arrived and treated the boy for mild hypothermia.
A frostbite advisory continues for Friday in Ottawa, and the temperature when the boy was found was colder than -20 C. The windchill also made it feel colder than -30 C.
The boy was taken to hospital in stable condition. He has since been reunited with his mother.
Ottawa police are investigating.