Public Safety Minister Bill Blair made the announcement on Twitter on Friday morning.
He adds in a tweet that the government will provide details on Monday about plans to let fully vaccinated Canadians and permanent residents enter the country.
The border between Canada and the US remains closed to all nonessential travel.
Canada's decision to prioritize first doses, however, has created a gap on full vaccinations: about 45 per cent of Americans have had two doses, compared to just 16 per cent in Canada.
Prime Minister Justin Trudeau confirmed on Friday that the federal government is working with the provinces to develop a national vaccine passport for global travel that's expected to be ready sometime this fall. About 65 per cent of Canadians have received their first dose, according to data compiled by CTV News, while the Bloomberg Vaccine Tracker shows 53 per cent of US residents have had a single shot.
"We're still seeing cases across the country and we want to get them down". "In the initial phase we are going to be working with the ArriveCan app in ways that people can upload an image of their proof of vaccination ... so that border agents on their return to Canada can verify that they are fully vaccinated".
"In coordination with the USA, we are extending restrictions on non-essential global travel and with the United States until July 21st, 2021".
"We are sticking with our principle of doing everything necessary to keep Canadians safe even as we move forward on loosening restrictions in a responsible way", said Trudeau. He noted how France now allows Canadians and Americans to visit, which makes it easier to travel overseas than within this country and to our closest neighbour.
Vaccination rates are one of the key benchmarks Trudeau's government is considering before allowing more non-essential travel.
On Friday, Legault insisted what's most important is that people who have received a first dose of AstraZeneca get a booster shot - no matter which vaccine they choose.
Travellers will need to have been fully vaccinated 14 days or more before they arrive in Canada.
The scenario envisioned, and laid out to premiers during a Thursday night call with Trudeau, would see restrictions gradually eased starting July 21 for fully vaccinated travellers first, said Quebec Premier François Legault said.
"It's disappointing because it flies in the face of science and is unfair to Canadians who are being denied the ability to travel, and it's obviously very damaging to us economically as well", Perrin Beatty, president of the Canadian Chamber of Commerce, said in a phone interview.