Published Monday, November 16, 2020 5:36AM EST
Last Updated Monday, November 16, 2020 11:24AM EST
The stricter public health measures come into effect in Hamilton, York and Halton regions.
Toronto joined Peel Region in the red alert level - the highest short of a full lockdown - on Saturday.
Today's developments come just days after Premier Doug Ford lowered the thresholds for his colour-coded restrictions system.
He said on Friday that recent COVID-19 projections show the province is “staring down the barrel of another lockdown.”