Environment Canada has issued a yellow frost advisory for Milton and Halton Hills, as sub-zero temperatures threaten to damage local gardens and crops this weekend. The advisory, issued on Friday, May 1, 2026, warns of freezing conditions that could harm sensitive vegetation well ahead of the region’s typical last frost date of May 28.
Residents should expect temperatures to drop to 0 C overnight on May 1 and further dip to minus 5 C on the night of May 2. These temperatures fall within the critical range for tender plants like tomatoes, peppers, beans, and strawberries, which can sustain significant damage when the mercury hits freezing, according to the Ontario Ministry of Agriculture, Food and Agribusiness.
The weather agency maintains a high level of confidence in this forecast, which carries a moderate impact level. The advisory covers a large portion of southern Ontario, including Milton, where agriculture remains a significant part of the local economy and identity.
Local gardeners and farmers are encouraged to take protective measures, such as covering sensitive vegetation, to minimize potential losses. Protecting these plants is particularly important for the area, as the region supports a large share of provincial agricultural jobs.
The Old Farmer’s Almanac notes that these frost events, while occurring before the historical average for the area, are a reminder of the volatility of early spring weather. Residents are encouraged to stay updated on local conditions as temperatures fluctuate throughout the weekend.
