On January 25th 2025 the Canada Border Services Agency posted this page announcing the end of all entry to Canada from the US via the PCT. and on January 27th they posted this news release PCT hikers wishing to reach the border and northern terminus monument will need to then hike back to a trail exit point in the US such as Harts Pass.
Prior to the 2020 Covid-19 lockdown hikers could enter Canada via the PCT and then present their long-distance permits to border guards when they returned to the US at a highway border station. Now any trail crossing at the border is prohibited.
Entering the US from Canda on the PCT was prohibited in 2010.
John Modlin, head of the US Customs and Border Protection (CBP) determined that there is no legal southbound entry into the United States at the northern terminus of the PCT. The CBP issued a press release on July 1st, 2010 reminding hikers of the law and explaining that penalties could include a year in jail and $5,000 fine. The letter was repeated in numerous newspapers and on the PCTA web site. The CBP is a sub department of the Department of Homeland Security, then lead by Janet Napolitano.