The states of Sonora and Quintana Roo do not observe daylight savings. The remaining 30 states do, but not all on the same date. Towns that are less than 20 kms from the US border have coordinated their DST with that of those US border towns. Check out the lists below.
April 1st – October 28th
AguascalientesBaja California SurCampecheChiapas ChihuauaCiudad de MexicoCoahuilaColima DurangoGuanajuatoGuerreroHidalgo JaliscoMexicoMichoacanMorelos NayaritNuevo LeonOaxacaPuebla QueretaroSan Luis PotosiSinaloaTabasco TaumalipasTlaxcalaVeracruzYucatan Zacatecas
March 11th – November 4th
Baja CaliforniaChihuahua (north)Coahuila (north)Nuevo Leon (north) Taumalipas (north)