Wind chill values near -35 C are expected Friday night into Saturday morning.
According to the federal weather agency, extreme cold puts everyone at risk.
Environment Canada is advising residents to watch for cold-related symptoms, including shortness of breath, chest and muscle pain, numbness and colour-change in fingers and toes.
“Dress in layers that you can remove if you get too warm,” Environment Canada says. “The outer layer should be wind resistant.”