Home > Time Zones > Abbreviations > MST – Mountain Standard Time

MST – Mountain Standard Time / Mountain Time (Standard Time)

Also known as: MT – Mountain Time, NAMST – North American Mountain Standard Time

MST is currently only used in a few locations

North America: Only some locations are currently on MST because most places in this time zone are currently on summer time / daylight saving time and are observing MDT.

Time zone map of MST
Currently observing MST.
Observes MST part of the year.
Areas with same time currently (UTC -7:00).
Currently observing MST – Mountain Standard Time.
Observes MST – Mountain Standard Time part of the year, but not currently.
Currently has same time zone offset as MST (UTC -7:00) but different time zone name.

Mountain Standard Time (MST) is 7 hours behind Coordinated Universal Time (UTC). This time zone is a standard time zone and is used in: North America.

This time zone is often called Mountain Time Zone.

See full time zone map

Summer Time & DST

Some places observe daylight saving time/summer time during the summer, and therefore use MDT (Mountain Daylight Time) in the summer.

Email time zone indicator: -0700

An email sent from someone in the Mountain Standard Time (MST) time zone will have the time zone listed as "-0700" in the headers of the email. (However, "-0700" does not have to be in Mountain Standard Time, as other time zones could have the same UTC offset).

Where and when is MST 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, Mellette, Pennington, Perkins, Shannon, Todd, and Ziebach, and the western parts of Jones and 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

Mexican states using MST all year

  • Sonora

U.S. states using MST all year

  • ArizonaShow

    except Navajo Nation

Other time zones in UTC -7:00

Some time zones exist that have the same offset as MST, but can be found under a different name:

MST time now

Only used in a few locations

3:00:43PM

Tuesday, June 2, 2015

  • MST will be observed in Edmonton starting from Nov 1, 2015 at 2:00 AM
  • UTC Offset: UTC -7:00
  • 3 hours behind Washington DC
  • Most locations changed to MDT

MDT time now

4:00:43PM

Tuesday, June 2, 2015

UTC Offset: UTC -6:00

Go to MDT


Find current time and time zone by city


Advertising

Other names

HNR – Heure Normale des Rocheuses (French)

Example cities

Canada – Edmonton (Winter)
U.S.A. – Phoenix (All Year)

Related time zones

MDT – Mountain Daylight Time (Daylight Time)


Time Zone Map with DST

Time zone map

Time Zone Map


Time zones by continent/region

See all Time zone abbreviations


Time zones Tools