Also known as: MDST – Mountain Daylight Saving Time, NAMDT – North American Mountain Daylight Time
No locations currently on MDT. Would you like to see MST?
North America: MDT is currently not observed because locations are on standard time and are observing MST.
This time zone is often called Mountain Daylight Time.
Winter Time & DST
This time zone is a daylight saving/summer time zone, in the winter some places will switch to the corresponding standard time zone: MST (Mountain Standard Time).
Where and When is MDT Observed?
U.S. states using MDT in the summer and MST in the winter:
- Arizona - Navajo Nation only
- Idaho - most of the state except western counties
Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone and north part of Idaho
- Kansas - some western counties only
Greeley, Hamilton, Sherman and Wallace
- Nebraska - western counties
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
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
- South Dakota - western counties
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
El Paso and Hudspeth and part of Culberson
Canadian provinces/territories using MDT in the summer and MST in the winter:
- British Columbia - a few eastern communities
Cranbrook, Golden, Invermere
- Northwest Territories
- Nunavut - Kugluktuk, Cambridge Bay only (Other parts use EST/EDT or EST only)
- Saskatchewan - only Lloydminster
Mexican states using MDT in the summer and MST in the winter:
Other Time Zones in UTC -6
Some time zones exist that have the same offset as MDT, but can be found under a different name: