The term Mountain Time (MT) is often used to denote the local time in areas observing either Mountain Standard Time (MST) or Mountain Daylight Time (MDT).
Mountain Standard Time is 7 hours behind Coordinated Universal Time (UTC).
Mountain Daylight Time is 6 hours behind UTC.
In locations observing Daylight Saving Time (DST) during part of the year, Mountain Time is not static but switches between MST and MDT.
Where and when is Mountain Time observed?
North America
U.S. states using MST in the winter and MDT in the summer
- Arizona - Navajo Nation only
- Colorado
- Idaho - most of the state except western counties
- Kansas - some western counties only
- Montana
- Nebraska - western counties
- New Mexico
- North Dakota - South-Western parts
- Oregon - parts of Malheur county only
- South Dakota - western counties
- Texas - a few counties in west
- Utah
- Wyoming
Canadian provinces/territories using MST in the winter and MDT in the summer
- Alberta
- British Columbia - a few eastern communities
- 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
MST all year round
Some locations, such as the ones below don't switch and are in MST all year long.