Environment Canada has issued a frost advisory for parts of southern Ontario as temperatures are expected to near freezing overnight. The advisory, which came into effect on May 9, 2026, warns residents that frost could damage sensitive plants and crops.
Areas Affected
The frost advisory covers several regions in southern Ontario, including Kitchener, Waterloo, and surrounding areas. Temperatures are forecast to drop close to the freezing mark, posing a risk to tender vegetation.
Precautionary Measures
Residents are advised to cover or bring indoors any sensitive plants, such as seedlings and tropical species, to protect them from frost damage. Gardeners should also consider using frost blankets or other protective coverings.
This advisory comes as southern Ontario experiences a late-season cold snap, with temperatures dipping below seasonal norms. The frost advisory is expected to remain in effect until Saturday morning, when temperatures are forecast to rise.
Weather Outlook
According to Environment Canada, a ridge of high pressure will bring clear skies and light winds overnight, allowing temperatures to drop rapidly. Daytime temperatures are expected to rebound to seasonal levels by the weekend.
Residents are encouraged to stay updated on weather alerts and take necessary precautions to protect their gardens and outdoor plants.
