The states in the Mountain Time zone (MST) are west of the great plains (Central time) and east of the coastal states (Pacific Time zone). It includes the states that contain most (if not all) of the Rocky Mountains. (Refer to the states below in RED. read more
Arizona does not observe Daylight Saving Time (DST) from March through November each year, so for half the year, the time in Phoenix, Flagstaff, and other cities in Arizona will be different than other places in the Mountain Standard Time (MST) zone. read more
This time zone is often called Mountain Time Zone. See full time zone map. Summer Time & DST. Some places observe daylight saving time/summer time during the summer, and therefore use MDT (Mountain Daylight Time) in the summer. Email Time Zone Indicator: -0700. An email sent from someone in the Mountain Standard Time (MST) time zone will have the time zone listed as "-0700" in the headers of the email. read more