MST Time Now
UTC offset
hours
What Is MST?
Mountain Standard Time (MST) is a time zone that is 7 hours behind Coordinated Universal Time (UTC−7). It is used in the Mountain Time zone of the United States and Canada during the winter months. In summer, most areas switch to MDT (Mountain Daylight Time, UTC−6), which is one hour ahead.
MST vs MDT
MST (UTC−7) is the standard offset used from early November to mid-March. MDT (UTC−6) takes effect from mid-March to early November when clocks "spring forward" one hour. The key exception is Arizona, which does not observe daylight saving time and remains on MST year-round.
| Feature | MST | MDT |
|---|---|---|
| UTC Offset | UTC−7 | UTC−6 |
| Active Period | Nov–Mar | Mar–Nov |
| Arizona | Year-round | Not observed |
Where Is MST Used?
The Mountain Time zone spans several US states including Colorado, Wyoming, Montana, Utah, New Mexico, and parts of Arizona, Idaho, Oregon, North Dakota, South Dakota, Nebraska, Kansas, and Texas. In Canada, it covers Alberta and parts of British Columbia, Saskatchewan, and the Northwest Territories.