No. Mexico City no longer observes daylight saving time: Mexico’s Time Zone Law (Ley de los Husos Horarios) took effect on October 30, 2022 and ended seasonal clock changes for most of the country, including the capital.
Under the law, Mexico City is in the Central Zone, referenced to the meridian 90 degrees west of Greenwich, so it stays on standard time, six hours behind UTC, all year. The law says only one standard time applies in each zone, with seasonal time allowed only for the northern border. That border exception covers Baja California and listed border municipalities in Chihuahua, Coahuila, Nuevo León and Tamaulipas, such as Ciudad Juárez, Nuevo Laredo, Reynosa and Matamoros, which change clocks from 2 a.m. on the second Sunday of March until 2 a.m. on the first Sunday of November to stay in step with U.S. neighbors. The 2022 law replaced Mexico’s 2001 time system law and the 2002 decree that had set summer time nationwide. For travelers, this means the time gap between Mexico City and U.S. cities shifts by an hour when the United States changes its clocks.
Image: Mexico City Reforma skyline by Jonathan Salvador, CC BY-SA 4.0, via Wikimedia Commons.