Mexico observes Daylight Saving Time on a different schedule than the US and Canada. Also, different states within Mexico change their clocks on different days. Confusing? Let me help explain.
Starting in 2010, the border states of Mexico with the US change their clock the same as the US does. This was done to facilitate the commerce between the US and the Mexican border states.
Here in Cancun, for the 3 weeks between the time the US changes and we change, it is confusing and chaotic.
Some travelers to Cancun and the Riviera Maya have a difficult time figuring out their flight times. Cancun and the Riviera Maya is on Central Standard Time (CST), but for those 3 weeks between time changes we are an hour different.
For most of Mexico, including Cancun and Riviera Maya.
The Mexican cities and states that change their clocks with the US are:
Anahuac, Nuevo Leon
Mexicali, Baja California
Nuevo Laredo, Tamaulipas
Piedras Negras, Coahuila
Tijuana, Baja California