A frost advisory was issued for the City of Calgary and surrounding communities in southern Alberta, including Lethbridge, Red Deer, Drumheller and Medicine Hat.
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Several central Alberta communities, including Edmonton and the surrounding Capital Region, were also included in the advisory.
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Environment Canada said frost could damage some crops in frost-prone areas as temperatures drop below the freezing mark in central and southern Alberta Monday night.
Those with gardens are advised to cover their plants.
READ MORE: Frost advisories – what needs to come out of the garden?
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