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Mountain Standard Time (MST) is 7 hours behind Coordinated Universal Time (UTC). This time zone is in use during standard time in: North America. This time zone is often called Mountain Time Zone. Summer Time & DST. Some places observe daylight saving time/summer time during the summer, and therefore use MDT (Mountain Daylight Time) in the summer.What state is completely in the Mountain Time Zone?
The Mountain Time Zone includes the states of Arizona*, Colorado, part of Idaho, part of Kansas, Montana, part of Nebraska, New Mexico, part of North Dakota, part of Oregon, part of South Dakota, part of Texas, Utah, and Wyoming. Most of Arizona does not observe daylight saving time.