USA Time Zone Map

Explore time zone map of the US, The United States is divided into several time zones. The main ones are Eastern, Central, Mountain, and Pacific Time Zones. Each zone is one hour apart from the next. This means when it's 12:00 PM in the Eastern Time Zone, it's 11:00 AM in the Central Time Zone, 10:00 AM in the Mountain Time Zone, and 9:00 AM in the Pacific Time Zone. Alaska and Hawaii have their own time zones too. These time zones help people across the country coordinate times for work, TV shows, and other activities. It's important to know these time zones, especially when you travel or call someone in a different part of the country.

USA Time Zone Map



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About USA Time Zone Map

Explore US time zone map, Time in the United States of America, by law, is divided into 9 standard time zones covering the American states, territories and other U.S. possessions, with most of the U.S. observing DST (daylight saving time) for generally the spring, summer, and fall months. The time zone boundaries and daylight saving time observance are organized by the Department of Transportation. Official and extremely precise timekeeping services (clocks) are presented by 2 federal agencies: NIST (the National Institute of Standards and Technology) (an agency of the Department of Commerce); and UNSO (the United States Naval Observatory). The clocks managed by these services are kept in synchronization with each other as well as with those of other internationally recognized timekeeping organizations.

It is the mix of the time zone and DST rules, along with the timekeeping services, which calculate the legal civil time for any United States location at any moment.

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United States and Regional Time Zones

In the United States, standard time zones and the rules for daylight saving time are set by federal law (15 USC §260). This law decides when daylight saving time starts and ends, if it's used. The Secretary of Transportation has the power to decide which time zones different regions will use and whether they'll follow daylight saving time. This is done with the states' input. Since August 9, 2007, these time zones are defined by how many hours they are ahead of or behind Coordinated Universal Time (UTC). Before this, they were based on the solar time at different longitudes west of Greenwich, UK.

The official names of the time zones are what's used in laws and official documents. The shorter abbreviations we often use are just for convenience and are not official. Also, these abbreviations can be the same as those used in other parts of the world for different time zones.

The United States of America and its surrounding areas use 9 standard time zones. As defined by U.S. law they are:

Time ZoneDSTStandard 
Atlantic(not observed)UTC−04:00Puerto Rico, U.S. Virgin Islands
EasternUTC−04:00UTC−05:00Connecticut, Delaware, District of Columbia, Georgia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Vermont, Virginia, West Virginia; Partially: Florida, Indiana, Kentucky, Michigan, Tennessee; No DST observed, not defined by 15 U.S.C. §260: Navassa Island, Bajo Nuevo Bank, Serranilla Bank
CentralUTC−05:00UTC−06:00Alabama, Arkansas, Chicago, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma, Wisconsin; Partially: Florida, Indiana, Kansas, Kentucky, Michigan, Nebraska, North Dakota, South Dakota, Tennessee, Texas
MountainUTC−06:00UTC−07:00Arizona (no DST outside of Navajo Nation), Colorado, Montana, New Mexico, Utah, Wyoming; Partially: Idaho, Kansas, Nebraska, North Dakota, Oregon, South Dakota, Texas
PacificUTC−07:00UTC−08:00California, Nevada, Washington (state); Partially: Idaho, Oregon
AlaskaUTC−08:00UTC−09:00Partially: Alaska
Hawaii‑AleutianUTC−09:00UTC−10:00Hawaii (no DST observed in Hawaii); Partially: Alaska; No DST observed, not defined by 15 U.S.C. §260: Johnston Atoll
American Samoa(not observed)UTC−11:00American Samoa; Not defined by 15 U.S.C. §260: Jarvis Island, Midway Atoll, Palmyra Atoll, Kingman Reef
 (not observed)UTC−12:00Not defined by 15 U.S.C. §260: Baker Island, Howland Island
 (not observed)UTC+12:00Not defined by 15 U.S.C. §260: Wake Island
Chamorro(not observed)UTC+10:00Guam, Northern Mariana Islands

List of U.S. States and Territories by Time Zone

States

StateTime Zone
Alabama(AL)Central Standard Time (CST)
Alaska(AK)Alaska Standard Time (AKST)
Aleutian Islands Hawaii-Aleutian Standard Time (HST)
Arizona(AZ)Mountain Standard Time (MST)
The Navajo Nation uses Daylight Saving Time (DST), the rest of the state does not
American SamoaSamoa Time (SST)
American Samoa does not use Daylight Saving Time (DST)
Arkansas(AR)Central Standard Time (CST)
California(CA)Pacific Standard Time (PST)
Colorado(CO)Mountain Standard Time (MST)
Connecticut(CT)Eastern Standard Time (EST)
Delaware(DE)Eastern Standard Time (EST)
District of Columbia(DC)Eastern Standard Time (EST)
Florida(FL)Most of the state: Eastern Standard Time (EST)
West of the Apalachicola River: Central Standard Time (CST)
Georgia(GA)Eastern Standard Time (EST)
Guam (GU)Chamorro Standard Time (ChST)
Guam does not use Daylight Saving Time (DST)
Hawaii(HI)Hawaii-Aleutian Standard Time (HST)
Hawaii does not use Daylight Saving Time (DST)
Idaho(ID)Most of the state: Mountain Standard Time (MST)
North of the Salmon River: Pacific Standard Time (PST)
Illinois(IL)Central Standard Time (CST)
Indiana(IN)Most of the state: Eastern Standard Time (EST)
Some counties near the southwestern and northwestern border of the state use Central Standard Time (CST)
Iowa(IA)Central Standard Time (CST)
Kansas(KS)Most of the state: Central Standard Time (CST)
Greeley, Hamilton, Sherman and Wallace counties: Mountain Standard Time (MST)
Kentucky(KY)Western half of the state: Central Standard Time (CST)
Eastern half of the state: Eastern Standard Time (EST)
Louisiana(LA)Central Standard Time (CST)
Maine(ME)Eastern Standard Time (EST)
Maryland(MD)Eastern Standard Time (EST)
Massachusetts(MA)Eastern Standard Time (EST)
Michigan(MI)Most of the state: Eastern Standard Time (EST)
Dickinson, Gogebic, Iron and Menominee Counties: Central Standard Time (CST)
Minnesota(MN)Central Standard Time (CST)
Mississippi(MS)Central Standard Time (CST)
Missouri(MO)Central Standard Time (CST)
Montana(MT)Mountain Standard Time (MST)
Nebraska(NE)Most of the state: Central Standard Time (CST)
Western part of the state: Mountain Standard Time (MST)
Nevada(NV)Most of the state: Pacific Standard Time (PST)
2 small towns, Jackpot and West Wendover: Mountain Standard Time (MST)
New Hampshire(NH)Eastern Standard Time (EST)
New Jersey(NJ)Eastern Standard Time (EST)
New Mexico(NM)Mountain Standard Time (MST)
New York(NY)Eastern Standard Time (EST)
North Carolina(NC)Eastern Standard Time (EST)
North Dakota(ND)Most of the state: Central Standard Time (CST)
Western North Dakota: Mountain Standard Time (MST)
Northern Mariana Islands(MP)Chamorro Standard Time (ChST)
The CNMI does not use Daylight Saving Time (DST)
Ohio(OH)Eastern Standard Time (EST)
Oklahoma(OK)Central Standard Time (CST)
Oregon(OR)Most of the state: Pacific Standard Time (PST)
Part of Malheur County: Mountain Standard Time (MST)
Pennsylvania(PA)Eastern Standard Time (EST)
Puerto Rico (PR)Atlantic Standard Time (AST)
Puerto Rico does not use Daylight Saving Time (DST)
Rhode Island(RI)Eastern Standard Time (EST)
South Carolina(SC)Eastern Standard Time (EST)
South Dakota(SD)Eastern South Dakota: Central Standard Time (CST)
Western South Dakota: Mountain Standard Time (MST)
Tennessee(TN)West Tennessee: Central Standard Time (CST)
Middle Tennessee, plus Marion County: Central Standard Time (CST)
East Tennessee, except Marion County: Eastern Standard Time (EST)
Texas(TX)Most of the state: Central Standard Time (CST)
El Paso and Hudspeth Counties: Mountain Standard Time (MST)
United States Virgin Islands (USVI)Atlantic Standard Time (AST)
The USVI does not use Daylight Saving Time (DST)
Utah(UT)Mountain Standard Time (MST)
Vermont(VT)Eastern Standard Time (EST)
Virginia(VA)Eastern Standard Time (EST)
Washington(WA)Pacific Standard Time (PST)
West Virginia(WV)Eastern Standard Time (EST)
Wisconsin(WI)Central Standard Time (CST)
Wyoming(WY)Mountain Standard Time (MST)

Federal District

Washington, D.C. does use DST (Daylight Savings Time).
Federal districtTime zone
Washington, D.C.UTC−5: Eastern Standard Time

Territories

The territories of the U.S. do not use Daylight Savings Time (DST).
TerritoryTime zone
American SamoaUTC-11: Samoa Standard Time
GuamUTC+10: Chamorro Standard Time
Northern Mariana IslandsUTC+10: Chamorro Standard Time
Puerto RicoUTC-4: Atlantic Standard Time (AST)
U.S. Virgin IslandsUTC-4: Atlantic Standard Time (AST)
Wake IslandUTC+12: Wake Island Time Zone


Time in the United States

The United States uses nine main time zones. These zones include all the states, territories, and other areas owned by the U.S. Most places also change their clocks for daylight saving time in the spring, summer, and fall. This means they move the clock forward by one hour in the spring and back by one hour in the fall. The Department of Transportation looks after the time zones and daylight saving rules. In September 2022, they said they would create a detailed map showing all this.

Two government groups provide very accurate time. These are the National Institute of Standards and Technology (NIST), which is part of the Department of Commerce, and the United States Naval Observatory (USNO). They make sure their clocks always show the same time as each other and with clocks around the world.

The time zones, daylight saving rules, and these accurate clocks decide the official time in any place in the U.S. at any time.

History of US Time Zones

Before the United States had standard time zones, each town and city would set their clocks to noon based on the sun's position, adjusted for the equation of time. This method worked because people didn't travel far or fast, and there wasn't instant communication like the telegraph.

As trains and telegraphs became popular, using local solar time caused problems. By the late 1800s, American railroads had many time zones. Every train station set its own time, making it hard to plan train schedules and confusing for travelers. Trains could travel hundreds of miles a day, and each city had its own time. In the U.S., there were over 300 local times. Railroads tried to fix this by creating 100 railroad time zones, but it wasn't enough.

Cleveland Abbe, a weather service chief, introduced four standard time zones for his weather stations and suggested this system to the railroads. The railroads needed a uniform time plan for train schedules. On November 18, 1883, these four time zones started in the U.S. At noon in Chicago, time signals were sent by telegraph to major cities.

In October 1884, an international conference in Washington, D.C., decided the prime meridian for timekeeping would pass through Greenwich Observatory in the UK. This established Greenwich Mean Time (GMT) as the world's time standard. The U.S. time zones were based on this, referring back to GMT.

In 1960, Coordinated Universal Time (UTC) was introduced as the new standard. It's similar to mean solar time at 0° longitude and doesn't change for daylight saving. While UTC and GMT are often used interchangeably, GMT is no longer precisely defined. UTC is a successor to GMT.

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