The Ontario government announced on Friday that another region is now heading into lockdown.
Lambton Public Health will officially enter the grey zone on Monday, March 15 at 12:01 a.m.
However, it's not the only region that will be facing tighter restrictions.
Northwestern Health Unit, which is currently in the yellow-protect zone, will be moving to the red-control zone.
The Leeds, Grenville and Lanark District Health Unit will also be moving from the green-prevent zone to the yellow.
What other regions are in the grey zone?
Currently, four other regions are also in Ontario's grey zone.
The stay-at-home order was lifted for Toronto and Peel and the regions were placed in lockdown on March 8.
Thunder Bay District was also placed in this zone on March 1.
Most recently, the Ontario government pulled the "emergency brake" on Public Health Sudbury and Districts.
Why are regions being moved into more restricted zones?
Christine Elliott, Deputy Premier and Minister of Health, states that regions will move into zones based on COVID-19 trends in their community.
Lambton Public Health’s case rate increased by 30.9% from March 3 to 9, 2021, which resulted in the region being placed in grey.
"The latest modelling suggests we are at a critical stage in our fight against this devastating virus, and that the actions we take now will help ensure people stay safe," she states.
"As we near completion of Phase One and prepare to rollout Phase Two of our vaccine distribution plan next month, we urge everyone to continue following all public health measures and advice to help prevent further transmission and protect our health system capacity."