Since March of 2020, fully vaccinated Canadians can finally enter the United States through a land or sea crossing for non-essential travel as of today (November 8, 2021).
On October 12, 2021, the announcement was made by the US Department of Homeland Security to open the land and ferry crossings to Canada and Mexico.
The United States is considering Canadians who have mixed doses of the COVID-19 vaccine to be fully vaccinated.
WHO-approved vaccines includ Moderna, Pfizer, AstraZeneca and its Indian-made counterpart, Covishield. So travelers with any combination of these vaccines will be allowed to enter the U.S.
Canadian’s entering into the United States for non-essential reasons do not need to provide proof of a negative COVID-19 test.
Canadians coming back home do need to provide a mandatory pre-arrival molecular COVID-19 test and submit it to their ArriveCAN app within 72 before arriving back in the country.
For Canadians taking a trip less than 72 hours, they are allowed to take their pre-arrival molecular test before they leave Canada. If the test is more than 72 hours old when they re-enter Canada, they will be required to get a new pre-arrival molecular test in the United States.
The Canada Border Services Agency said in a statement Antigen tests or commonly known as "rapid tests" are not accepted. Fully vaccinated travelers who are eligible to enter Canada continue to be subject to mandatory random testing on arrival.
Unvaccinated or partially vaccinated travelers who are eligible to enter Canada must continue to follow pre-arrival, arrival, and Day-8 molecular COVID-19 testing requirements, and quarantine for 14 days.