Mountain Time Zone - wikipedia Mountain Time Zone Mountain Time Zone MST or UTC − 07 UTC offset MST UTC − 7 : 00 MDT UTC − 6 : 00 Current time ( Refresh the clock. ) MDT 12 : 29 pm on Sep 19, 2017 MST 11 : 29 am on Sep 19, 2017 Observance of DST DST is observed in certain regions of this time zone between the 2nd Sunday in March and the 1st Sunday in November. DST began Mar 12, 2017 DST ends Nov 5, 2017 The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time ( UTC ) when standard time is in effect, and by subtracting six hours during daylight saving time ( UTC − 6 ). The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich Observatory. In the United States, the exact specification for the location of time zones and the dividing lines between zones is set forth in the Code of Federal Regulations at 49 CFR 71. cor In the United States and Canada, this time zone is generically called Mountain Time ( MT ). Specifically, it is Mountain Standard Time ( MST ) when observing standard time, and Mountain Daylight Time ( MDT ) when observing daylight saving time. The term refers to the fact that the Rocky Mountains, which range from northwestern Canada to the US state of New Mexico, are located almost entirely in the time zone. In Mexico, this time zone is known as the Zona Pacífico ( Pacific Zone ). In the United States and Canada, the Mountain Time Zone is to the east of the Pacific Time Zone and to the west of the Central Time Zone. In some areas, starting in 2007, the local time changes from MST to MDT at 2 am MST to 3 am MDT on the second Sunday in March and returns at 2 am MDT to 1 am MST on the first Sunday in November. Sonora in Mexico and most of Arizona in the United States do not observe daylight saving time, and during the spring, summer, and autumn months they are on the same time as Pacific Daylight Time. The Navajo Nation, most of which lies within Arizona, does observe DST, although the Hopi Nation, as well as some Arizona state offices lying within the Navajo Nation, do not. The largest city in the Mountain Time Zone is Phoenix, Arizona. The Phoenix metropolitan area is the largest metropolitan area in the zone ; the next largest metropolitan area that observes Mountain Daylight Time is the binational El Paso -- Juárez area, closely followed by Denver, Colorado. TV broadcasting in the Mountain Time Zone is typically tape - delayed one hour, so that shows match the broadcast times of the Central Time Zone ( i.e. prime time begins at 7 pm MT following the same order of programming as the Central Time Zone ). Contents 1 Canada 2 Mexico 3 United States 4 See also 5 Notes 6 References Canada Main article : Time in Canada Only one Canadian province is fully contained in the Mountain Time Zone : Alberta One province and one territory is split between the Mountain Time Zone and the Pacific Time Zone : British Columbia - far eastern regions Northwest Territories - Tungsten One territory and one province is split between the Mountain Time Zone and the Central Time Zone Nunavut : Kitikmeot Region Saskatchewan : Lloydminster and vicinity Mexico Main article : Time in Mexico The following states have the same time as Mountain Time Zone : Baja California Sur Chihuahua Nayarit : Except for the Bahía de Banderas municipality, which uses the Central Time Zone. Sonora -- no daylight saving time, always on MST. Sinaloa Revillagigedo Islands ( Colima ) : three of the four islands have the same time as Mountain Time Zone, Isla Socorro, San Benedicto Island and Roca Partida. United States Main article : Time in the United States Five states are fully contained in the Mountain Time Zone : Arizona -- no DST Colorado Montana Utah Wyoming Three states are split between the Mountain Time Zone and the Pacific Time Zone : Idaho -- Southern Idaho Nevada -- all, except for West Wendover, Mountain City, Owyhee, Jackpot, and Jarbidge Oregon -- primary time zone for Malheur County Seven states are split between the Mountain Time Zone and the Central Time Zone : Kansas -- Sherman, Wallace, Greeley and Hamilton counties Nebraska -- western third North Dakota -- southwest part New Mexico -- all, except for Nara Visa Oklahoma -- Kenton South Dakota -- western half Texas -- El Paso and Hudspeth counties See also Effects of time zones on North American broadcasting Notes Jump up ^ The specification for the Mountain Time Zone in the United States is set forth at 49 CFR 71.8. The boundary between Central and Mountain time zones is set forth at 49 CFR 71.7, and the boundary between Mountain and Pacific time zones is set forth at 49 CFR 71.9. References Jump up ^ `` 49 CFR 71.8 Mountain zone ''. Code of Federal Regulations. Retrieved October 7, 2011. Jump up ^ `` 49 CFR 71.7 Boundary line between central and mountain zones ''. Code of Federal Regulations. Retrieved October 7, 2011. Jump up ^ `` 49 CFR 71.9 Boundary line between mountain and Pacific zones ''. Code of Federal Regulations. Retrieved October 7, 2011. Jump up ^ Robbins, Ted ( March 11, 2007 ). `` Arizona Says No to Daylight - Saving Time ''. National Public Radio. Retrieved June 18, 2012. World time zone map U.S. time zone map History of U.S. time zones and UTC conversion Canada time zone map Time zones for major world cities Official times across Canada Official times across Mexico Canada time map U.S. time map Time zones in North America Time zone Hours from UTC : Standard time Hours from UTC : Daylight saving time Hawaii -- Aleutian ( in Hawaii ) -- 10 -- 10 Hawaii -- Aleutian ( in Alaska ) -- 10 -- 9 Alaska -- 9 -- 8 Pacific -- 8 -- 7 Mountain ( Arizona and Sonora only ) -- 7 -- 7 Mountain ( other states ) -- 7 -- 6 Central ( Saskatchewan only ) -- 6 -- 6 Central ( other states ) -- 6 -- 5 Eastern ( Southampton Island, Atikokan and New Osnaburgh / Pickle Lakeonly ) -- 5 -- 5 Eastern ( other states ) -- 5 -- 4 Atlantic ( Natashquan River ) -- 4 -- 4 Atlantic ( other states ) -- 4 -- 3 Newfoundland -- 3 : 30 -- 2 : 30 Saint Pierre and Miquelon and most of Greenland -- 3 -- 2 See also Time in Canada Time in Denmark Time in Mexico Time in the United States Retrieved from `` https://en.wikipedia.org/w/index.php?title=Mountain_Time_Zone&oldid=801153269 '' Categories : Time zones Time in Canada Time in Mexico Time zones in the United States Hidden categories : All articles with unsourced statements Articles with unsourced statements from June 2012 Talk Contents About Wikipedia Afrikaans Español Français 한국어 Bahasa Indonesia Македонски 日本 語 Norsk Norsk nynorsk Polski Simple English Svenska Türkçe Українська اردو Tiếng Việt 中文 Edit links This page was last edited on 18 September 2017, at 00 : 09. 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Question: where does the time change in west texas
Answer: El Paso and Hudspeth