In Mexico, the corresponding time zone is known as the Zona Noroeste (Northwest Zone) and observes the same daylight saving schedule as the United States and Canada.

One Canadian province is split between the Pacific Time Zone and the Mountain Time Zone: The border between time zones in British Columbia was decided in a 1972 plebiscite held in northeastern and southeastern electoral districts due to their ties to neighboring Alberta.

[11] The United States Congress passed the Energy Policy Act of 2005, which moved the local time changes from PST to PDT to the second Sunday in March and the reversal from PDT to PST to the first Sunday in November.

[11] Like other Canadian provinces that observe daylight time, British Columbia adopted the same dates in April 2006, to take effect in March 2007 alongside the U.S.[12] Several Mexican states, including Baja California, implemented the new dates for the daylight time changes in 2010, ending a three-year period where cities across the Mexico–United States border had a one-hour difference for two months a year.

[14] The Washington State Legislature passed a bill in May 2019 that would move the state to permanent daylight time, subject to Congressional approval;[15] the Oregon Legislative Assembly passed a similar bill a month later, while California's attempt failed.