Environment Canada issued the advisory just before noon on Friday.
It stretches from the Windsor area, up to London, Hamilton, parts of the Greater Toronto Area and Kingston.
“Patchy frost is expected tonight into Saturday morning as temperatures drop to near the freezing mark,” the weather agency said.
“Cover up plants, especially those in frost-prone areas. Take preventative measures to protect frost-sensitive plants and trees.”
The weather agency noted that frost advisories are issued when temperatures are expected to reach the freezing mark during the growing season.
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