Ontario is reporting 413 new COVID-19 cases and four deaths from the virus.
Health Minister Christine Elliott says 273 cases are in people who are not fully vaccinated or have an unknown vaccination status.
She says 140 cases are in fully vaccinated people.
The numbers are based on 31,889 completed tests.
The province says 161 people are in intensive care with COVID-related critical illness, including 107 people on ventilators.
The province says 87 per cent of Ontario residents aged 12 and older have one dose of a COVID-19 vaccine and 83 per cent have received both shots.