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Mountain Time Zone: Map


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The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time, sometimes called Greenwich Mean Time (UTC−7) during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time in the spring, summer, and early autumn (UTC−6). The clock time in this zone is based on the mean solar time of the 105th meridian west of the Greenwich Observatorymarker.

In the United Statesmarker and Canadamarker, this time zone is generically called Mountain Time (MT). Specifically, it is Mountain Standard Time (MST) when observing standard time (Winter), and Mountain Daylight Time (MDT) when observing daylight saving time. In Mexicomarker this time is known as the Pacific Zone. In the USA, the exact specification for the location of time zones and the dividing line between zones is set forth in the Code of Federal Regulations at 49 CFR 71.The specification for the Mountain Time Zone in the United States is set forth at 49 CFR 71.8, and is listed in text and pdf formats.

The boundary between Central and Mountain is set forth at 49 CFR 71.7, and is listed in text and pdf formats.

The boundary between Mountain and Pacific is set forth at 49 CFR 71.9, and is listed in text and pdf formats.

The zone is one hour ahead of the Pacific Time Zone and one hour behind the Central Time Zone.

In some areas, starting in 2007, the local time changes from MST to MDT at 02:00 LST to 03:00 LDT on the second Sunday in March and returns at 02:00 LDT to 01:00 LST on the first Sunday in November.

Most of Arizonamarker does not observe daylight saving time, and during summer months is on the same time as Pacific Daylight Time, though it is still called Mountain Standard Time in Arizona. The Navajo Nation, most of which lies within Arizona, does observe daylight saving time, although the Hopi Nation (as well as some Arizona state offices) lying within the Navajo Nation do not.

The largest city in the Mountain Time Zone is Phoenix, Arizonamarker.

TV broadcasting in the Mountain Time Zone is typically tape-delayed one hour, so that shows match the broadcast times of the Central Time Zone (i.e. prime time begins at 7:00 p.m. MT following the same order of programming as the other two time zones).


The following provinces and areas are part of the Mountain Time Zone:

*the Northwest Territoriesmarker (except for Tungstenmarker)
*most of the Kitikmeot Regionmarker of Nunavutmarker
*portions of southeastern and northeastern British Columbiamarker
*the area of Saskatchewanmarker immediately surrounding the city of Lloydminstermarker


The following states are part of the Mountain Time Zone:

*Baja California Surmarker
*Nayaritmarker: Except from the Bahía de Banderasmarker municipality which uses the Central time zone.
*Sonoramarker: always on MST - no daylight saving time like Arizona.
*Revillagigedo Islandsmarker (Colimamarker): 3 of the 4 islands uses the Mountain Time Zone, Isla Socorromarker, San Benedicto Islandmarker and Roca Partidamarker.

United States

The following states or areas are part of the Mountain Time Zone:

*Arizonamarker - no daylight saving time, always on MST, except in the Navajo Nation.
*New Mexicomarker
*Idahomarker - southern half, south of Salmon River
*Oregonmarker - northern three quarters of Malheur Countymarker, on Idaho border
*North Dakotamarker - southwestern quadrant, southwest of (Missouri Rivermarker)
*South Dakotamarker - western half
*Nebraskamarker - western third
*Kansasmarker - the seven counties along the Colorado border
*Oklahomamarker - Although the entire state is legally on Central Time, the unincorporated community of Kentonmarker, near the extreme western end of the Panhandlemarker, unofficially observes Mountain Time.
*Texasmarker - the two westernmost counties (Hudspeth, El Pasomarker) and a portion of Culberson Countymarker
*Nevadamarker - the border towns of West Wendovermarker (near Utah) and Jackpotmarker (near Idaho)

Arizonamarker does not observe daylight saving time. However, the Navajo Nation, the bulk of whose area is within Arizona, observes daylight saving time throughout its territory. The Hopi Reservation, an enclave inside the Navajo Nation, does not observe daylight saving time.


See also: List of zoneinfo time zones
US         +394421−1045903 America/Denver   ?
US      +433649−1161209 America/Boise    south Idaho & east Oregon
US      +364708−1084111 America/Shiprock Navajo
US      +332654−1120424 America/Phoenix  Arizona

Major metropolitan areas

*- Largest city in time zone



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