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Mountain Time Zone

Time zone of North America

Time zone of North America

FieldValue
titleMountain Time Zone
imagetimezoneswest.PNG
captionShown offsets are Standard
offset−07:00
dst offset−06:00
initialsMST
dst initialsMDT
dst usesome

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 tiempo de la montaña or zona Pacífico ('Pacific Zone'). In the United States and Canada, the Mountain Time Zone is to the east of the Pacific Time Zone and to the west of the Central Time Zone.

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

Canada

Main article: Time in Canada

One province and two territories are fully contained in the Mountain Time Zone:

  • Alberta
  • Northwest Territories
  • Yukon (no DST)

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.

One province is split between the Mountain Time Zone and the Pacific Time Zone:

  • British Columbia – northeastern and southeastern regions

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

  • Nunavut – Kitikmeot Region
  • Saskatchewan – Lloydminster and vicinity

Mexico

Main article: Time in Mexico

As of October 30, 2022, Mexico abandoned daylight saving time, with certain exceptions. The following states have an offset equal to Mountain Standard Time:

:*Baja California Sur :*Nayarit: except for the Bahía de Banderas municipality, which uses the Central Time Zone. :*Sonora :*Sinaloa :*Chihuahua: Observes Daylight Savings Time, only in northwestern border municipalities (Janos, Ascensión, Juárez, Guadalupe, and Práxedis Gilberto Guerrero) :*Revillagigedo Islands (Colima): three of the four islands have the same time as Mountain Time Zone: Socorro Island, San Benedicto Island and Roca Partida.

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

United States

Main article: Time in the United States

Six states are fully contained in the Mountain Time Zone:

  • Colorado
  • Montana
  • New Mexico
  • Utah
  • Wyoming
  • Arizona (does not use daylight saving time except for Navajo Nation)

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

  • Idaho: Southern Idaho and the portion of Idaho County south of the Salmon River
  • Oregon: the majority of Malheur County
  • Nevada: West Wendover
    • The communities of Jackpot, Jarbidge, Mountain City, and Owyhee unofficially observe Mountain Time, although they are officially within the Pacific Time Zone.

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

  • Kansas: Sherman, Wallace, Greeley and Hamilton counties
  • Nebraska: western one third
  • North Dakota: the southwest corner counties (Adams, Billings, Bowman, Golden Valley, Grant, Hettinger, Slope, Stark) observe MST. The counties of McKenzie, Dunn, and Sioux are split.
  • South Dakota: western half
  • Texas: El Paso, Hudspeth, and northwestern Culberson counties

Major metropolitan areas

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

  • Albuquerque, New Mexico
  • Billings, Montana
  • Boise, Idaho
  • Boulder, Colorado
  • Calgary, Alberta
  • Cheyenne, Wyoming
  • Ciudad Juárez, Chihuahua
  • Ciudad Obregón, Sonora
  • Colorado Springs, Colorado
  • Culiacán, Sinaloa
  • Metropolitan Denver
    • Arvada, Colorado
    • Aurora, Colorado
    • Centennial, Colorado
    • Denver, Colorado
    • Lakewood, Colorado
    • Westminster, Colorado
  • Edmonton, Alberta
  • El Paso, Texas
  • Flagstaff, Arizona
  • Fort Collins, Colorado
  • Greeley, Colorado
  • Hermosillo, Sonora
  • La Paz, Baja California Sur
  • Lake Havasu City, Arizona
  • Las Cruces, New Mexico
  • Lethbridge, Alberta
  • Los Mochis, Sinaloa
  • Mazatlán, Sinaloa
  • Missoula, Montana
  • Nogales, Sonora
  • Metropolitan Phoenix
    • Chandler, Arizona
    • Gilbert, Arizona
    • Glendale, Arizona
    • Mesa, Arizona
    • Peoria, Arizona
    • Phoenix, Arizona
    • Surprise, Arizona
    • Tempe, Arizona
  • Pueblo, Colorado
  • Rapid City, South Dakota
  • Red Deer, Alberta
  • San Luis Río Colorado, Sonora
  • Tepic, Nayarit
  • Tucson, Arizona
  • Wasatch Front
    • Orem, Utah
    • Provo, Utah
    • Salt Lake City, Utah
    • West Jordan, Utah
    • West Valley City, Utah
  • Yuma, Arizona

Notes

References

References

  1. Robbins, Ted. (March 11, 2007). "Arizona Says No to Daylight-Saving Time". [[National Public Radio]].
  2. "49 CFR 71.8 Mountain zone". [[Code of Federal Regulations]].
  3. "49 CFR 71.7 Boundary line between central and mountain zones". Code of Federal Regulations.
  4. "49 CFR 71.9 Boundary line between mountain and Pacific zones". Code of Federal Regulations.
  5. "HOME - Yukon Legislation".
  6. "OnTimeZone.com Exceptions, Oddities and Notes".
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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