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Eastern Ontario and parts western Quebec are in for a chilly Monday night.
Environment Canada has issued a yellow advisory for frost overnight that will continue into the early hours of Tuesday morning.
The advisory covers most communities along Lake Ontario and the St. Lawrence River, including Kingston, Ont., and stretches north to Ottawa-Gatineau and western Quebec.
Temperatures could drop to zero degrees, with patches of frost also expected, the agency wrote.
Enviornment Canada recommends covering plants, especially in frost-prone areas, as trees and crops could be damaged.
Temperatures will rise back up on Tuesday across the affected area, to highs around 14 C, according to the 3 p.m. forecast on Monday.
The coldest May 11 in Ottawa on record was back in 2010, when temperatures fell to -4.5 C, according to CBC’s climate dashboard.