Also known as: Mountain Time (MT) and Mountain Daylight Time (MDT)
Caution: This is NOT the current local time in most locations in that time zone
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.
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 map
What 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.
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:
- Baja California Sur
- Chihuahua
- Nayarit
- Sinaloa
Mexican states using MST all year:
- Sonora
US states using MST all year:
- ArizonaShow
except Navajo Nation
Canadian provinces/territories using MST all year:
- Some locations in British ColumbiaShow
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:
- PDT – Pacific Daylight Time
- T – Tango Time Zone
