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Mountain Time (MT)

Also known as: Mountain Standard Time (MST) and Mountain Daylight Time (MDT)

Time zone map of MST
Currently observing MST.
Areas with same time currently (UTC -7).
Currently observing MST – Mountain Standard Time.
Currently has same time zone offset as MST (UTC -7) but different time zone name.

The term Mountain Time (MT) is often used to denote the local time in areas observing either Mountain Standard Time (MST) or Mountain Daylight Time (MDT).

In other words, in locations observing Daylight Saving Time (DST) during part of the year, Mountain Time is not static but switches between MST and MDT.

Mountain Time UTC Offset

See Time Zone Map

What Is Mountain Time?

Mountain Time (MT) is the second westernmost time zone in the United States and Canada. It is also used in Mexico.

The MT time zone is the least populated time zone in the US. It spans from northern Canada to Mexico near the equator.

In North America, Mountain Time shares a border with Central Time (CT) in the east and with Pacific Time (PT) in the west.

What Does MT Time Zone Mean?

Unlike other time zone denominations, which have a fixed time, Mountain Time refers to a geographical area where the time changes twice yearly as Daylight Saving Time (DST) begins and ends. Mountain Standard Time is UTC-7, while Mountain Daylight Time is UTC-6.

Most North American time zones also have generic terms, including Pacific Time (PT), Central Time (CT), Eastern Time (ET), and Atlantic Time (AT).

Converting Mountain Time to Other US Time Zones

Where and when is Mountain Time observed?

North America

US states using MST in the winter and MDT in the summer

  • Arizona - Navajo Nation only
  • Colorado
  • Idaho - most of the state except western counties Show

    Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone and north part of Idaho

  • Kansas - some western counties only Show

    Greeley, Hamilton, Sherman and Wallace

  • Montana
  • Nebraska - western counties Show

    Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes, Deuel, Dundy, Garden, Grant, Hooker, Keith, Kimball, Morrill, Perkins, Scotts Bluff, Sheridan, and Sioux and the western part of Cherry

  • New Mexico
  • North Dakota - South-Western parts Show

    counties of Adams, Billings, Bowman, Golden Valley, Grant, Hettinger, Mercer, Slope and Stark, and southern parts of Dunn and McKenzie, most of Morton and Sioux counties

  • Oregon - parts of Malheur county only Show

    rest of Oregon is PST/PDT

  • South Dakota - western counties Show

    Bennett, Butte, Corson, Custer, Dewey, Fall River, Haakon, Harding, Jackson, Lawrence, Meade, Pennington, Perkins, Shannon, and Ziebach, and the western parts of Stanley

  • Texas - a few counties in west Show

    El Paso and Hudspeth and part of Culberson

  • Utah
  • Wyoming

Canadian provinces/territories using MST in the winter and MDT in the summer

  • Alberta
  • British Columbia - a few eastern communities Show

    Cranbrook, Golden, Invermere

  • Northwest Territories
  • Nunavut - Kugluktuk, Cambridge Bay only (Other parts use EST/EDT or EST only)
  • Saskatchewan - only Lloydminster

Mexican states using MST in the winter and MDT in the summer

  • Baja California Sur
  • Chihuahua
  • Nayarit
  • Sinaloa

MST all year round

Some locations, such as the ones below don't switch and are in MST all year long.

North America

Mexican states using MST all year

  • Sonora

US states using MST all year

  • ArizonaShow

    except Navajo Nation

Canadian provinces/territories using MST all year

  • Some locations in British ColumbiaShow

    Creston, the Northern Rockies Regional Municipality, and most of Peace River Regional District (except Fort Ware)

  • Yukon