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MT – Mountain Time

Time Zone names, codes and abbreviations for Standard Time and Daylight Saving Time (DST) around the world.

Time zone map of MDT
Currently observing MDT.
Areas with same time currently (UTC -6).
Currently observing MDT – Mountain Daylight Time.
Currently has same time zone offset as MDT (UTC -6) but different time zone name.

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

Mountain Standard Time is 7 hours behind Coordinated Universal Time (UTC).

Mountain Daylight Time is 6 hours behind UTC.

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

See full time zone map

Where and when is Mountain Time observed?

North America

U.S. 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

U.S. 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)