Mountain Standard Time (MST) is 7 hours behind Coordinated Universal Time (UTC). This time zone is in use during standard time in: North America.
See full time zone mapWhat Is Mountain Standard Time?
Mountain Standard Time is the second westernmost time zone in the United States and Canada. It is also used in Mexico.
It covers all or parts of 13 states in the US and five provinces or territories in Canada.
The MST time zone is the least populated time zone in the USA. It spans from northern Canada to Mexico near the equator.
In North America, Mountain Standard Time shares a border with Central Standard Time (CST) in the east and with Pacific Standard Time (PST) in the west.
Mountain Standard Time Zone
Mountain Standard Time (MST) is a standard time zone in use from the first Sunday in November to the second Sunday in March—when Daylight Saving Time (DST) is not in effect. Mountain Daylight Time (MDT) is used during the remainder of the year.
Some areas in British Coloumbia, including Creston, Fort Nelson, Fort St. John, and Dawson Creek use Mountain Standard Time all year.
MST Is the Mountain Time Zone
In everyday usage, MST is often referred to as Mountain Time (MT) or the Mountain Time Zone. This can add a bit of confusion as the term Mountain Time does not differentiate between standard time and Daylight Saving Time, so Mountain Time switches between MST and MDT in areas that use DST during part of the year.
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
- Mountain Standard Time (MST) is 2 hours behind Eastern Standard Time (EST).
To convert MST to EST, you have to add two hours. - Mountain Standard Time (MST) is 1 hour behind Central Standard Time (CST).
To convert MST to CST, you have to add one hour. - Mountain Standard Time (MST) is 1 hour ahead of Pacific Standard Time (PST).
To convert MST to PST, you have to subtract one hour.
Where and When is MST Observed?
North America
US states using MST in the winter and MDT in the summer
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Idaho - most of the state except western countiesBenewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone and north part of Idaho
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Kansas - some western counties onlyGreeley, Hamilton, Sherman and Wallace
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Nebraska - western countiesArthur, 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
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North Dakota - South-Western partscounties 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
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South Dakota - western countiesBennett, Butte, Corson, Custer, Dewey, Fall River, Haakon, Harding, Jackson, Lawrence, Meade, Pennington, Perkins, Shannon, and Ziebach, and the western parts of Stanley
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Texas - a few counties in westEl Paso and Hudspeth and part of Culberson
Canadian provinces/territories using MST in the winter and MDT in the summer
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British Columbia - a few eastern communitiesCranbrook, Golden, Invermere
Mexican states using MST in the winter and MDT in the summer
Mexican states using MST all year round
US states using MST all year round
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Arizonaexcept Navajo Nation
Canadian provinces/territories using MST all year round
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Some locations in British ColumbiaCreston, the Northern Rockies Regional Municipality, and most of Peace River Regional District (except Fort Ware)