US Customs and Border Protection (CBP) has extended, through August 21, 2021, COVID-19 restrictions, which allow entry to the United States through land ports of entry along the U.S. Canada and Mexico borders to “essential travel” only. The restrictions have been consistently extended on a monthly basis since April 2020.
Please see Federal Register notices for more information:
Canada: 30-Day Extension Notice 16.
Mexico: 30-Day Extension Notice 16.