The prime minister said it "would not be July 1," but that it would be "for next summer."
"The date will not be July 1, I can assure you of that," Trudeau said. "I don't know where that date came from."
Several provinces have asked the federal government to delay passing the legislation in order to give them more time to prepare.
A statement issued by the Health Department last month said, "as previously indicated, the government of Canada intends to bring the proposed Cannabis Act into force no later than July 2018."