MST – Mountain Standard Time

Time zone offset: UTC - 7 hours
MST is 7 hours behind of Coordinated Universal Time (UTC)

Note that most places observe daylight saving time/summer time during summer, and are therefore using MDT instead in the summer. See below for details.

Time zone abbreviations: MST, HNR
Full name is Mountain Standard Time
HNR – Heure Normale des Rocheuses (French)

Email time zone indicator: -0700

An email sent from someone in the 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 MST, as other time zones could have the same UTC offset).

Where and when is MST observed?
MST is used during winter in these US states (MDT during summer)

* Arizona - Navajo Nation only
* Colorado
* Idaho - most of the state except western counties
Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone and north part of Idaho
* Kansas - some western counties only
Greeley, Hamilton, Sherman and Wallace
* Montana
* Nebraska - western counties
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
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
rest of Oregon is PST/PDT

Example locations in MST

* Chihuahua - during winter
* Phoenix - all year