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−06:00). 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.[a]
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 how 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 US 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 but extends into Utah and New Mexico (which do observe DST), 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 Time is Denver, closely followed by the El Paso–Juárez area. 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).
|Mountain Time Zone|
|01:41, April 22, 2019 MDT|
|Observance of DST|
|DST is observed in some of this time zone.|
Only one Canadian province is fully contained in the Mountain Time Zone:
One province and one territory are split between the Mountain Time Zone and the Pacific Time Zone:
One territory and one province are split between the Mountain Time Zone and the Central Time Zone
The following states have the same time as Mountain Time Zone:
Five states are fully contained in the Mountain Time Zone:
Four states are split between the Mountain Time Zone and the Pacific Time Zone. The following locations observe Mountain Time:
Six states are split between the Mountain Time Zone and the Central Time Zone. The following locations observe Mountain Time:
The meridian 105° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.
The 105th meridian west forms a great circle with the 75th meridian east.
It serves as the reference meridian for the seventh time zone west of Greenwich, known as UTC-07 or the Mountain Time Zone in North America.
In the United States, Interstate Highway I-25 roughly parallels the meridian from Douglas, Wyoming to Las Vegas, New Mexico, and from Wellington, Colorado to the Prospect Road interchange (in Fort Collins, Colorado), I-25 happens to be almost exactly aligned along the 105th meridian west. The meridian bisects Denver, Colorado, passing through Denver Union Station. Throughout the Denver metro area, Kalamath Street is the road that most closely corresponds to the 105th meridian.1998 Major League Baseball All-Star Game
The 1998 Major League Baseball All-Star Game was the 69th playing of the midsummer classic between the all-stars of the American League (AL) and National League (NL), the two leagues comprising Major League Baseball. The game was held on July 7, 1998, at Coors Field in Denver, Colorado, the home of the Colorado Rockies of the National League. The first All-Star contest played in the Mountain Time Zone, the game resulted in the American League defeating the National League 13-8. It remains the highest-scoring All-Star Game in MLB history.
The pregame ceremony honored the United States Air Force Academy who provided the five-man color guard, flag presentations, and, at the end of country music singer Faith Hill's performance of the U.S. National Anthem, the flyover ceremonies. Hill's National Anthem performance was preceded by actress Gloria Reuben's performance of The Canadian National Anthem.
Twelve-year-old Elias Kurts was given the honor of throwing out the ceremonial first pitch, the first "non-celebrity" so honored.Area code 915
North American area code 915 is a state of Texas area code for telephone numbers in the El Paso area. It is one of the original area codes established in October 1947. Originally, it covered the north-western part of the state, north of Austin and west of Fort Worth, and stretched from the Oklahoma border to the Mexican border.
This once-vast area code was split three times, as follows:
In 1954, nearly the entire eastern portion (Lubbock and the South Plains) was combined with Fort Worth and the western portion of area code 214 in a flash cut as area code 817.
In 1957, most of the northeastern portion (the Texas Panhandle) was merged with the western portion of 817 to form area code 806.
In 2003, it was reduced to its current size in a three-way split with the western portion retaining area code 915, the eastern portion (Abilene, San Angelo, etc.) becoming 325, and the central portion (the Permian Basin) becoming 432.Counties currently served by area code 915 are Culberson, El Paso, and Hudspeth. It is the only area code in Texas that is predominantly in the Mountain Time Zone.
Towns and cities currently served by area code 915 include Anthony, Canutillo, Clint, Dell City, El Paso, Fabens, Fort Hancock, Horizon City, Salt Flat, San Elizario, Sierra Blanca, Socorro, Tornillo, and Van Horn.Beaver Lake 131
Beaver Lake 131 is an Indian reserve in Alberta, Canada, of the Beaver Lake Cree Nation.El Paso County, Texas
El Paso County is the westernmost county in the U.S. state of Texas. As of the 2010 census, the population was 800,647, making it the sixth-most populous county in the state of Texas. Its seat is the city of El Paso, the sixth-most populous city in Texas and the 19th-most populous city in the United States. The county was created in 1850 and later organized in 1871.El Paso is short for "El Paso del Norte", which is Spanish for "The Pass of the North". It is named for the pass the Rio Grande creates through the mountains on either side of the river. The county is northeast of the Mexico–United States border.
El Paso County is included in the El Paso metropolitan area. Along with Hudspeth County, it is one of two counties in Texas in the Mountain Time Zone (all other Texas counties use Central Time). El Paso County is one of nine counties that comprise the Trans-Pecos region of West Texas.Jarbidge, Nevada
Jarbidge is an unincorporated community in Elko County, Nevada, United States. Located at the bottom of the Jarbidge River's canyon near the north end of the Jarbidge Mountains, it lies within the Jarbidge Ranger District of the Humboldt-Toiyabe National Forest and is near the northwest edge of the Jarbidge Wilderness, approximately 10 miles (16 km) south of the Idaho–Nevada border. The ZIP code for Jarbidge is 89826.Jarbidge, along with the rest of Nevada except for the city of West Wendover, is legally in the Pacific Time Zone, but, along with other Idaho border towns such as Jackpot, Mountain City and Owyhee, unofficially observes the Mountain Time Zone due to closer proximity to and greater connections with towns in southern Idaho.KBSL-DT
KBSL-DT, virtual and VHF digital channel 10, is a CBS-affiliated television station licensed to Goodland, Kansas, United States. The station is owned by Gray Television. KBSL maintains a news bureau and advertising sales offices located on West 31st Street in southwestern Goodland, and its transmitter is located east of K-27 in rural northeastern Sherman County.
KBSL is part of the Kansas Broadcasting System (KBS), a statewide network of four full-power stations that relay programming from Wichita CBS affiliate KWCH-DT (channel 12) across central and western Kansas; KBSL incorporates local advertising and news inserts aimed at areas of northwestern Kansas and southwestern Nebraska within the Wichita–Hutchinson Plus television market (including Colby), as well as portions of east-central Colorado. KBSL is also a sister station to Wichita-licensed CW affiliate KSCW-DT (channel 33, wholly owned by Gray) and Derby-licensed Univision affiliate KDCU-DT (channel 31, owned by Entravision Communications and operated by Gray under joint sales and shared services agreements).
Because the station's signal lies between the Central and Mountain Time Zones (its city of license and transmitter facility are both located on the Mountain Time Zone side of the state), CBS primetime programming in the western part of the station's viewing area airs Monday through Saturday from 6:00 to 9:00 p.m. and Sunday from 5:00 to 9:00 p.m.; however, since it operates as a satellite station of Wichita-based KWCH, the station runs on a Central Time Zone schedule.KXMA-TV
KXMA-TV is a dual CW+/CBS-affiliated television station licensed to Dickinson, North Dakota, United States. It broadcasts a high definition digital signal on UHF channel 19 (or virtual channel 2.1 via PSIP) from a transmitter southwest of Dickinson. Owned by Nexstar Media Group, KXMA maintains a news bureau and advertising sales office at the intersection of West Villard Street and State Avenue North in Dickinson. As Dickinson is located in the Mountain Time Zone, the station's primetime schedule starts at 6 p.m. rather than the usual 7 p.m. start for the rest of Mountain Time, or in Central Time, where most of North Dakota is located.
KXMA's second digital subchannel is considered a semi-satellite of KXMB-TV in Bismarck, which is the flagship station of the four-station KX Television regional network. KXMC-TV in Minot is the oldest station and former flagship of the KX group, while KXMB provides master control and some internal operations for the entire network. KXMA-DT2 airs a time-shifted simulcast of KXMB in Mountain Time for most of the day, clearing all network and syndicated programming as provided through its parent. However, KXMA-DT2 airs separate legal identifications and commercial inserts. The KX network relays CBS network programming and other programs across central and western North Dakota, as well as bordering counties in Montana and South Dakota. KXMA serves the southwestern portion of the Bismarck–Minot market. The four stations are counted as a single unit for ratings purposes. Unlike the other KX stations, KXMA airs The CW Plus on its main signal—hence its on-air branding, Dakota's CW 2—and CBS programming (which aired on 2.1 until 2016) on DT2.Late night television
Late night television is one of the dayparts in television broadcast programming. It follows prime time and precedes the overnight television programming graveyard slot. The slot generally runs from about 11:30 PM to 2:00 AM local time, with variations according to the time zone and broadcaster.
In the United States and Canada, the term is synonymous with the late-night talk show, a type of comedic talk and variety show. Thus, the late night programming block is considered more important in North America. On most major-network stations, a late local newscast airs at the beginning of the block. (This is nearly universal in Canada, as late local news is an easy way to fulfill Canadian content requirements.)
Due to the complications of American and Canadian time zones, live professional sporting matches such as baseball, hockey, and basketball played in Pacific Time Zone and Mountain Time Zone cities, such as Denver, Los Angeles, Phoenix, Portland (Ore.), and Seattle, are often played in the primetime of the Pacific and Mountain Time Zones, but late night in the Central and Eastern time zones, and their lateness often contributes to a perceived bias for eastern teams in sports media.
In the United Kingdom, the late night spot is from 11:00 PM to 12:30 AM and not seen as a priority; ITV and Channel 4 program repeats in the time slot, and the BBC's channels primarily show BBC World News, air movies, or replay documentaries. Similarly, Australian television primarily airs American late shows, lower-priority imported series, or overflows of sports programming in the late night time slot.
On cable television, programming strategies in this time slot include timeshifts of prime time programs and, in the case of children's television channels, signing-off and allowing more adult-oriented fare for the overnight hours under another brand. Two examples are the children's channels Cartoon Network and Nickelodeon, which changes over to Adult Swim and Nick at Nite, respectively, at an hour when most pre-adolescent children go to sleep. Adult Swim and Nick at Nite typically airs series programming, such as reruns of sitcoms, that may have coarser language and more adult themes than Cartoon Network and Nickelodeon.After 11, Japan airs adult talk or variety shows as well as late night anime. This is also true of the United States-based cable channel Cartoon Network, which targets children and young teens during daytime and primetime hours, but changes over to its Adult Swim brand in late-night slots.Pacific Time Zone
The Pacific Time Zone (PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time (UTC−08:00). During daylight saving time, a time offset of UTC−07:00 is used.
In the United States and Canada, this time zone is generically called the "Pacific Time Zone". Specifically, time in this zone is referred to as "Pacific Standard Time" (PST) when standard time is being observed (early November to mid-March), and "Pacific Daylight Time" (PDT) when daylight saving time (mid-March to early November) is being observed. In Mexico, the corresponding time zone is known as the Zona Noroeste (Northwest Zone) and observes the same daylight saving schedule as the U.S. and Canada. The largest city in the Pacific Time Zone is Los Angeles; the city’s metropolitan area is the largest in this time zone.
The zone is two hours ahead of the Hawaii–Aleutian Time Zone, one hour ahead of the Alaska Time Zone, one hour behind the Mountain Time Zone, two hours behind the Central Time Zone, three hours behind the Eastern Time Zone, and four hours behind the Atlantic Time Zone.Southern Idaho
Southern Idaho is a generic geographical term roughly analogous with the areas of the U.S. state of Idaho located in the Mountain Time Zone. It particularly refers to the combined areas of the Boise metropolitan area, the Magic Valley and Eastern Idaho.
Major cities in southern Idaho include Boise, Caldwell, Nampa, Meridian, Pocatello, Idaho Falls and Twin Falls.Time in Arizona
Time in Arizona, as in all US states, is regulated by the United States Department of Transportation.Arizona is in the Mountain Time Zone and most of the state remains in Mountain Standard Time (MST) all year.Time in Canada
Canada is divided into six time zones, based on proposals by Scottish Canadian railway engineer Sir Sandford Fleming, who pioneered the use of the 24-hour clock, the world's time zone system, and a standard prime meridian. Most of Canada operates on standard time from the first Sunday in November to the second Sunday in March and daylight saving time the rest of the year.Time in Idaho
The U.S. state of Idaho is covered by two time zones, as described below. All locations observe daylight saving time.
The Pacific Time Zone (UTC−08:00, DST UTC−07:00) covers an area roughly coterminous with the Idaho Panhandle or North Idaho:
Kootenai County (includes Coeur d'Alene)
Latah County (includes Moscow)
Nez Perce County (includes Lewiston)
Portion of Idaho County north of the Salmon River
The towns of Burgdorf and WarrenAn easy way to distinguish the line is that it essentially follows the line that divides Washington and Oregon. If a county in Idaho is due east of Washington, it's Pacific Time. On the other hand, the counties of Idaho that are fully due east of Oregon are on Mountain Time.
The Mountain Time Zone (UTC−07:00, DST UTC−06:00) covers the rest of the state.Time in Kansas
Time in Kansas is divided into two time zones. The Central Time Zone contains 101 of the states 105 counties. Only four counties do not fall into the Central Time Zone, rather the Mountain Time Zone. The four counties are Sherman, Wallace, Greeley, and Hamilton, all of which border Colorado. Until 1990, the western half of Kearny County was also on Mountain time.
Cheyenne County creates a unique situation where one can cross into the Mountain Time Zone from three ends of the county. The exception is Rawlins County, which borders Cheyenne County to the east.Time in Oregon
Time in Oregon is divided into two zones. The vast majority of the state is contained in the Pacific Time Zone. Most of sparsely populated Malheur County, including its largest city, Ontario, and its county seat, Vale, are in the Mountain Time Zone due to their proximity to Boise, Idaho. The time zone division occurs at the southwest corner of township 35 S, range 37 E (approximately 42.45 degrees north latitude), continuing east to the state line, then south along the Oregon-Idaho border to the Nevada state line.Drewsey in Harney County is officially in the Pacific Time Zone, but some residents unofficially observe Mountain Time due to proximity to Malheur County. Local businesses strictly enforce the practice of Pacific Time, however.Time in South Dakota
South Dakota lies in both the Mountain Time Zone and the Central Time Zone. Mountain Time roughly contains the western half of the state, but not all of it. Rapid City is the largest city in the Mountain Time portion of the state. Central Time contains the eastern half of the state and roughly more of the state than the Mountain Time Zone and includes the state capital Pierre and the largest city, Sioux Falls.
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|
|Pacific (in Alaska)||–8||–8|
|Pacific (other states/provinces)||–8||–7|
|Mountain (Arizona, Sonora, and Northeastern British Columbia only)||–7||–7|
|Mountain (other states/provinces)||–7||–6|
|Central (Saskatchewan only)||–6||–6|
|Central (other states/provinces)||–6||–5|
|Eastern (parts of Nunavut and the Caribbean)||–5||–5|
|Eastern (other states/provinces)||–5||–4|
|Atlantic (Natashquan River)||–4||–4|
|Atlantic (other states/provinces)||–4||–3|
|Saint Pierre and Miquelon
and most of Greenland