He said that means residents of those three regions won't have a curfew.
He also said two families will be able to gather in homes and more sports will be allowed, including contact sports.
"This gives us an idea of where we're going," said Legault.
"What we hope obviously is that red zones become orange and orange zones eventually become yellow zones. I believe this is quite encouraging."
At the same press conference, Legault announced the curfew in Quebec red zones would be pushed back to 9:30 p.m. as of March 17.