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The largest city in the Mountain Time Zone is Phoenix, Arizona. The Phoenix metropolitan area is the largest metropolitan area in the zone; the next largest metropolitan area that observes Mountain Time is Denver, closely followed by the El Paso–Juárez area.Is Arizona on Mountain Standard Time?
Mountain Standard Time. Almost all of Arizona is on the same time zone, Mountain Standard Time (MST), all year. The time zone has a UTC offset of minus 7 hours (UTC-7). It is also known as Mountain Time, but that term refers both to standard time and the time zone which is elsewhere used during DST: Mountain Daylight Time (MDT).Why is Arizona on Mountain Time?
Arizona is on Mountain Standard Time. We don’t observe Daylight Savings Time here so when the rest of the country falls back or forward we stay the same. This means that when everyone switches to DST we are essentially the same as Pacific Time. Unless you are on the Navajo Reservation because they do observe Daylight Savings Time.