Enjoy the T-shirt weather while you can, Toronto!
Environment and Climate Change Canada (ECCC) has just issued a Yellow Advisory for frost across the Greater Toronto Area and large parts of southern Ontario, warning that temperatures are set to dip sharply overnight into early Tuesday morning.
Under ECCC’s colour-coded alert system, a Yellow Advisory indicates weather that could lead to moderate, localized disruptions or damage. As of today’s warning, it marks the potential for temperatures to fall close to the freezing mark overnight. Temperatures in Toronto are expected to drop to around 4 degrees Celsius, while wind chills could make it feel closer to 1 C in exposed or frost-prone areas.
If your balcony is still home to summer flowers, herbs or other plants that haven’t made their seasonal move indoors, tonight could be the time to bring them inside. Potted plants, particularly tropical varieties and tender herbs, are especially vulnerable to a sudden frost and should be moved indoors before temperatures drop.
For plants that are staying outside, covering them with burlap, lightweight frost cloth or even an old bedsheet can provide some protection. Plastic should generally be kept from directly touching the leaves, as it can trap moisture and transfer cold to the plant.
It’s also a good time to disconnect garden hoses and turn off outdoor water valves, helping protect outdoor plumbing as temperatures begin to fall.
What This Means For Winter
An overnight frost can feel like a dramatic shift after a warm start to fall, but it doesn’t necessarily mean Toronto is headed for a particularly harsh winter.
Long-range forecasts can offer some reassurance, with broader climate patterns pointing toward a potentially milder winter across the region. However, seasonal forecasts can change considerably as the season progresses, so it’s still too early to know exactly what winter has in store for the city.
