US Customs and Border Protection (CBP) has extended, through July 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.
Please see Federal Register notices for more information:
Canada: 30-Day Extension Notice 15 at 86 FR 32764
Mexico: 30-Day Extension Notice 15 at 86 FR 32766