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Mountain Standard Time (MST)

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.

Time zone map of MST
Currently observing MST.
Observes MST part of the year.
Areas with same time currently (UTC -7).
Currently observing MST – Mountain Standard Time.
Observes MST – Mountain Standard Time part of the year, but not currently.
Currently has same time zone offset as MST (UTC -7) but different time zone name.

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

Where and When is MST Observed?

North America

US states using MST in the winter and MDT in the summer:

Canadian provinces/territories using MST in the winter and MDT in the summer:

Mexican states using MST in the winter and MDT in the summer:

Mexican states using MST all year:

US states using MST all year:

Canadian provinces/territories using MST all year:

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: