Ontario

Frost Advisory Issued for Sarnia and Western Lambton County

By

Emma Kelly
May 1, 2026 9:57 am

Environment Canada has issued a frost advisory for Sarnia, Petrolia, and Western Lambton County as temperatures are expected to drop near or below freezing throughout the day and into tonight. The advisory, which highlights the risk of patchy frost damaging vegetation, comes as the region experiences a late-spring cold snap.

Residents and gardeners are advised to take precautions to protect their plants. According to official recommendations, those with frost-sensitive vegetation, especially in frost-prone areas, should cover their plants to prevent damage from the plummeting temperatures.

The forecast indicates that temperatures will remain low, with an expected overnight low of -1°C and a wind chill reaching -5. This weather event is somewhat unusual for early May, as the average last spring frost date for Sarnia is typically April 25, according to data from the Almanac.

The frost advisory has been confirmed by The Weather Network. As of 5:00 AM EDT, the temperature at the Sarnia Chris Hadfield Airport was 3.8°C.

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