All schools across Norfolk County, Haldimand County, Brant County and the City of Brantford are closed today as freezing rain and heavy rainfall move into the region.
Student transportation has been cancelled, with officials citing safety concerns for both students and drivers.
Forecasters say ice accumulation of up to five millimetres is possible in some areas, creating hazardous road and sidewalk conditions.
Environment officials say a low-pressure system is bringing a mix of rain and freezing rain, with temperatures hovering near the freezing mark.
Rainfall totals of 10 to 20 millimetres are expected before tapering off this evening, though freezing drizzle may persist overnight.
Residents are being urged to avoid unnecessary travel and use caution if heading outdoors.