Mountain Standard Time – MST Time Zone

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.

Time Zone Converter: UTC to MST

Where and When is MST Observed?

North America

US 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:

Mexican states using MST all year:

Sonora

US states using MST all year:

Arizona Show
except Navajo Nation

Canadian provinces/territories using MST all year:

Some locations in British Columbia Show
Creston, the Northern Rockies Regional Municipality, and most of Peace River Regional District (except Fort Ware)
Yukon

Other Time Zones in UTC -7

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

MST time now

2:40:11 am

Monday, September 1, 2025

Did you mean MDT?

MST is currently observed in Phoenix
MST will be observed in Edmonton, Denver starting from Nov 2, 2025 at 2:00 am
UTC Offset: UTC -7
3 hours behind Toronto

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Other names

HNR – Heure Normale des Rocheuses (French)

Example cities

Canada – Edmonton (Winter)
USA – Phoenix (All Year)
USA – Denver (Winter)

Related time zones

MDT – Mountain Daylight Time (Daylight Time)