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Mountain Time Zone

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The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time (UTC−07:00) is in effect, and by subtracting six hours during daylight saving time (UTC−06:00).

In Canada, Mexico, and the United States, this time zone is generically called Mountain Time (MT). Specifically, it is Mountain Standard Time (MST) when observing standard time, and Mountain Daylight Time (MDT) when observing daylight saving time. The term refers to the Rocky Mountains, which range from British Columbia to New Mexico. In Mexico, this time zone is known as the Script error: No such module "Lang". or Script error: No such module "Lang". ('Pacific Zone'). In the United States, the Mountain Time Zone is to the east of the Pacific Time Zone; in it and Canada, it is to the west of the Central Time Zone.

In some areas, starting in 2007, the local time changes from MST to MDT at 2Template:Nbspam MST to 3Template:Nbspam MDT on the second Sunday in March and returns at 2Template:Nbspam MDT to 1Template:Nbspam MST on the first Sunday in November.

Most of Mexico, and most of Arizona in the United States, do not observe daylight saving time (DST), and during the spring, summer, and autumn months they are on the same time as Pacific Daylight Time.[1] The Navajo Nation is the only part of Arizona that observes DST. Its territory lies mostly within Arizona but extends into Utah and New Mexico (both observe DST statewide). Meanwhile, the Hopi Reservation, despite being completely surrounded by the Navajo Nation, does not observe DST, and neither do some Arizona state offices located within the Navajo Nation.

The largest city in the Mountain Time Zone is Phoenix, Arizona; the Phoenix metropolitan area is the largest metropolitan area in the zone. The largest city that observes daylight saving time is Juárez, Chihuahua, Mexico.

The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich Observatory. In the United States, the exact specification for the location of time zones and the dividing lines between zones is set forth in the Code of Federal Regulations at 49 CFR 71.[lower-alpha 1]

Canada

Script error: No such module "Labelled list hatnote". Two provinces and two territories are fully contained in the Mountain Time Zone:

On September 24, 2020, Yukon switched to the Mountain Standard Time year-round. Therefore, clocks in Yukon and Alberta are the same in the winter, and Alberta is one hour ahead in summer. Previously, the territory had used the Pacific Time Zone with daylight saving time: UTC−8 in winter and UTC−7 in summer.[5]

On March 8, 2026, most of British Columbia in the Pacific Time Zone adopted UTC−7 year-round but continue to call their time zone "Pacific Time". Southeastern parts of the province (near the Alberta border) continue to observe daylight saving time: UTC−6 in the summer and UTC−7 in the winter.[6]

One territory and one province are split between the Mountain Time Zone and the Central Time Zone:

Mexico

Script error: No such module "Labelled list hatnote". As of October 30, 2022, Mexico abandoned daylight saving time, with certain exceptions. The following states have an offset equal to Mountain Standard Time:

The following states have an offset equal to Mountain Daylight Time:

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United States

Script error: No such module "Labelled list hatnote". Six states are fully contained in the Mountain Time Zone:

Three states are split between the Mountain Time Zone and the Pacific Time Zone. The following locations observe Mountain Time:

Five states are split between the Mountain Time Zone and the Central Time Zone. The following locations observe Mountain Time:

Major metropolitan areas

Alphabetical list of major cities located within the Mountain Time Zone. Cities in bold do not observe daylight saving time: Template:Div col

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See also

Notes

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References

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  1. ↑ Script error: No such module "citation/CS1".
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