A late‑April cold snap is prompting a yellow‑level frost advisory for Toronto and several parts of the GTA, with Environment Canada warning that temperatures will dip to near- or below-freezing overnight into Friday morning.
The advisory was issued at 9:10 a.m. Thursday applies to a wide stretch of southern Ontario.
It includes Toronto; the communities of Pickering, Oshawa, and the rest of southern Durham Region; the municipalities of Vaughan, Richmond Hill, and Markham; Hamilton, Mississauga, and Brampton; the towns of Halton Hills and Milton; the communities of Burlington and Oakville; and the broader Niagara Region.
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Environment Canada says the impact level is moderate with high confidence in the forecast, noting that patchy frost is likely to form under clearing skies and cold overnight air.
Residents are being urged to cover vulnerable plants or bring potted ones indoors, especially in frost‑prone or low‑lying areas where temperatures can fall more quickly.
The frost threat follows a stretch of below‑seasonal temperatures across the GTA. The region is heading into a chilly start to May, with daytime highs struggling to reach the low teens and overnight lows repeatedly dipping toward freezing.
Thursday’s high is expected to reach only 10°C, with scattered showers lingering. Friday will be even colder, with a high near 9°C and a low around 0°C, and the potential for flurries north of the city.
The weekend remains unsettled. Rain is forecast for Saturday with a high of 8°C, though Sunday will be drier but still cool, reaching a daytime high of 11°C.
More consistent double‑digit temperatures are expected to return next week, though rain remains in the forecast.
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