MST time now |
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13:18:08 Sun, 6 Jul 2025
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| UTC Offset: UTC -7 |
Mountain Standard Time (MST) operates at UTC−7 and is commonly referred to as "Mountain Time." It covers both its standard form (MST) and its daylight saving variant, Mountain Daylight Time (MDT, UTC−6). MST is observed during the winter months across parts of the western United States, western Canada, and a small section of northern Mexico. Regions following MST benefit from a consistent time standard that bridges the Central and Pacific Time Zones.
Importance and Global Use of MST
MST is essential for coordinating daily life, business, and transportation across large areas of the Rocky Mountain region, including cities like Denver, Phoenix, and Calgary. It supports industries such as tourism, mining, energy, and agriculture, ensuring predictable schedules for trade, travel, and public services in these vast territories.
Internationally, MST helps align timekeeping across North America, acting as a convenient intermediary between the Pacific and Central Time Zones. This supports smoother business operations, logistics, and communications both domestically and across borders, making MST a valuable part of continental time coordination.
Where and When MST is used worldwide
North America
US states using MST during winter and MDT during summer:
- Arizona - Navajo Nation only InfoRest of the state follow MST all year.
- Colorado
- Idaho - all except northern counties InfoAll except Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone, and north part of Idaho observe PST/PDT time zones.
- Kansas - few western counties onlyInfoGreeley, Hamilton, Sherman and Wallace
- Montana
- Nebraska - western counties InfoCounties are: Arthur, Banner, Box Butte, Chase, Cherry (west part), Cheyenne, Dawes, Deuel, Dundy, Garden, Grant, Hooker, Keith, Kimball, Morrill, Perkins, Scotts Bluff, Sheridan, and Sioux counties of Nebraska.
- New Mexico
- North Dakota - southwest counties only InfoThese southwest counties are: Adams, Billings, Bowman, Dunn (most), Golden Valley, Grant, Hettinger, McKenzie (south part), Mercer, Morton (most), Sioux (most), Slope, and Stark.
- Oregon - most of Malheur County only InfoRest of the state observe PST/PDT time zones.
- South Dakota - western counties only InfoWestern counties are: Bennett, Butte, Corson, Custer, Dewey, Fall River, Haakon, Harding, Jackson, Jones (west part), Lawrence, Meade, Mellette, Pennington, Perkins, Shannon, Stanley (west part), Todd, and Ziebach.
- Texas - few western counties only InfoEl Paso, Hudspeth, and most part of Culberson counties
- Utah
- Wyoming
Canadian provinces and territories using MST during winter and MDT during summer:
- Alberta
- British Columbia - some southeastern communities Info Some southeastern communities near the Alberta border (including Cranbrook and Fernie).
- Northwest Territories - all except the community of Tungsten InfoThe community of Tungsten observe PST/PDT time zones.
- Nunavut - west of 102° West and all communities in the Kitikmeot Region
- Saskatchewan - Lloydminster and surrounding area only
Mexican states using MST during winter and MDT during summer:
- Chihuahua - northwest border area Infonortheast border area observe CST/CDT time zones and rest of the state use CST year-around.
US states using using MST all year:
Canadian provinces and territories using MST all year:
- Yukon
- British Columbia - some eastern and southeastern communities InfoPeace River Regional District (including Dawson Creek and Fort St. John) and Creston area.
Mexican states using MST all year:
Other Time Zones in UTC -7
Other time zones share the same offset as Mountain Standard Time (MST), but are known by different names. While their clocks align, they may represent different regions or countries based on local time zone definitions.