COVID-19. Canada-U.S. border closure extended to Feb. 21 as coronavirus cases soar: Trudeau Since then, the closure has been extended month by month.With more contagious variants of the coronavirus spreading across the continent, Friday’s extension is unlikely to be the last.Blair tweeted that the government will continue to base its decisions on the border “on the best public health advice to keep Canadians safe.”Our government will never hesitate to take the strong action needed to keep Canadians safe from emerging variants of #COVID19.