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Mountain Time Zone

The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time (UTC−07:00) is in effect, and by subtracting six hours during daylight saving time (UTC−06:00).

Canada
Two provinces and two territories are fully contained in the Mountain Time Zone: • AlbertaBritish Columbia (no DST in most of province) • Northwest TerritoriesYukon (no DST) On September 24, 2020, Yukon switched to the Mountain Standard Time year-round. Therefore, clocks in Yukon and Alberta are the same in the winter, and Alberta is one hour ahead in summer. Previously, the territory had used the Pacific Time Zone with daylight saving time: UTC−8 in winter and UTC−7 in summer. On March 8, 2026, most of British Columbia in the Pacific Time Zone adopted UTC−7 year-round but continue to call their time zone "Pacific Time". Southeastern parts of the province (near the Alberta border) continue to observe daylight saving time: UTC−6 in the summer and UTC−7 in the winter. One territory and one province are split between the Mountain Time Zone and the Central Time Zone: • NunavutKitikmeot RegionSaskatchewanLloydminster and vicinity ==Mexico==
Mexico
As of October 30, 2022, Mexico abandoned daylight saving time, with certain exceptions. The following states have an offset equal to Mountain Standard Time, there called the (Pacific Zone): • Baja California SurNayarit: except for the Bahía de Banderas municipality, which uses the Central Time Zone. • SonoraSinaloaChihuahua: Observes Daylight Savings Time, only in northwestern border municipalities (Janos, Ascensión, Juárez, Guadalupe, and Práxedis Gilberto Guerrero) • Revillagigedo Islands (Colima): three of the four islands have the same time as Mountain Time Zone: Socorro Island, San Benedicto Island and Roca Partida. The following states have an offset equal to Mountain Daylight Time or Central Standard Time, there called the (Central Zone): • AguascalientesCampecheChihuahua, except for the northwestern border area (which follows MST/MDT) and northeastern border area (follows CST/CDT) • Ciudad de MéxicoCoahuila, except for northern border areas (CST/CDT) • Colima, except all of the Revillagigedo Islands. • ChiapasDurangoGuanajuatoGuerreroHidalgoJaliscoMéxicoMichoacánMorelosNuevo León, except for northern border areas (CST/CDT) • OaxacaPueblaQuerétaroSan Luis PotosíTabascoTamaulipas, except for northern border areas (CST/CDT) • TlaxcalaVeracruzYucatánZacatecas • Municipality of Bahía de Banderas in Nayarit ==United States==
United States
Six states are fully contained in the Mountain Time Zone: • ColoradoMontanaNew MexicoUtahWyomingArizona (does not observe daylight saving time except for Navajo Nation) Three states are split between the Mountain Time Zone and the Pacific Time Zone. The following locations observe Mountain Time: • Idaho: Southern Idaho and the portion of Idaho County south of the Salmon RiverOregon: the majority of Malheur CountyNevada: West Wendover • The communities of Jackpot, Jarbidge, Mountain City, and Owyhee unofficially observe Mountain Time, although they are officially within the Pacific Time Zone. Five states are split between the Mountain Time Zone and the Central Time Zone. The following locations observe Mountain Time: • Kansas: Sherman, Wallace, Greeley and Hamilton counties • Nebraska: western one third • North Dakota: the southwest corner counties (Adams, Billings, Bowman, Golden Valley, Grant, Hettinger, Slope, Stark) observe MST. The counties of McKenzie, Dunn, and Sioux are split. • South Dakota: western half • Texas: El Paso, Hudspeth, and northwestern Culberson counties == Major metropolitan areas ==
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