Time in North Dakota

Counties of North Dakota observing Mountain Time Zone

  Entire county observing Mountain Standard Time (MST)

  Part of county observing MST

Counties colored white observe central standard time

A majority of North Dakota counties are located in the Central Time Zone, with 8 counties in the southwest, west of the Missouri River, following Mountain Time.[1][2]

The counties which observe MST are as follows:[3]

• Adams County
• Billings County
• Bowman County
• Golden Valley County
• Grant County
• Hettinger County
• Slope County
• Stark County
• Parts of Dunn County, McKenzie County, and Sioux County

IANA time zone database

In the IANA time zone database, North Dakota is covered by five time zones to reflect changes in the border between the Central and Mountain time zones since 1970. Each of the five areas has had the same time within since January 1, 1970.

On October 25, 1992 Oliver County moved from Mountain Time to Central Time.[4][5] The IANA time zone database entry is named for the county seat and largest city Center.

On October 26, 2003 all of Morton County moved to Central Time. Prior to this, the western part of the county had used Mountain Time.[4] The database entry is named for New Salem, as the county seat Mandan was already using Central Time.

On November 7, 2010 Mercer County was moved from Mountain Time to Central Time.[2] The database entry is named for the county's largest city, Beulah.

Columns marked "*" contain the data from the file zone.tab:

c.c.*	coordinates*	TZ*	comments*	UTC offset	UTC offset DST	Note
US	+415100−0873900	America/Chicago	Central (most areas)	−06:00	−05:00	most of the state
US	+433649−1161209	America/Boise	Mountain - ID (south), OR (east)	−07:00	−06:00	southwestern North Dakota
US	+471551−1014640	America/North_Dakota/Beulah	Central - ND (Mercer)	−06:00	−05:00	Mercer County
US	+470659−1011757	America/North_Dakota/Center	Central - ND (Oliver)	−06:00	−05:00	Oliver County
US	+465042−1012439	America/North_Dakota/New_Salem	Central - ND (Morton rural)	−06:00	−05:00	western Morton County

References

1. MacPherson, James (2017-01-20). "North Dakota resets the debate over time zone disparity". AP News. Retrieved 2024-05-31.
2. "Relocation of Standard Time Zone Boundary in the State of North Dakota: Mercer County". FederalRegister.gov. 2010-09-29. Retrieved 2024-05-31.
3. "North Dakota Time". GreenwichMeanTime.com.
4. "Relocation of Standard Time Zone Boundary in the State of North Dakota: Morton County". FederalRegister.gov. 2003-07-22. Retrieved 2025-01-16.
5. "tzdb data for North and Central America and environs". iana.org. Retrieved 2025-01-16.

See also

• Time in the United States