Time in Arizona
Our time never changes, though we do end up on Pacific coast time once a year.
Time in Arizona, as in all U.S. states, is regulated by the United States Department of Transportation as well as by state and tribal law.
Most of Arizona is in the Mountain Time Zone and observes Mountain Time. Since 1968, most of the state—except the Navajo Nation—does not observe daylight saving time and remains on Mountain Standard Time (MST) all year. This results in most of Arizona having the same time as neighboring California and Nevada (outside of selected Nevada municipalities that officially or informally observe Mountain Time) each year from March to November, when locations in the Pacific Time Zone observe daylight saving time. From November to March, clocks across the state match those in neighboring Utah and New Mexico.
Daylight saving time
Unlike most of the United States, Arizona does not observe daylight saving time (DST), with the exception of the Navajo Nation. The Hopi Reservation, although entirely surrounded by the Navajo Nation, also does not observe DST. As a result, traveling east on Arizona State Route 264 from Tuba City during DST involves six time zone changes in less than 100 miles (160 km).
Background
Daylight saving time became official when the Uniform Time Act became law in 1966. However, states were allowed to opt out, which Arizona did. On March 21, 1968, the Arizona legislature passed the final version of SB 1, placing Arizona on Mountain Standard Time year-round.
“Time in Arizona” enters the record as our time never changes, though we do end up on Pacific coast time once a year. Crown Archives preserves that source wording while asking what Time, Arizona and time can confirm, complicate or overturn.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 16, 2026. The linked authority identifier is Q7805328. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1968 and 1966.
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This entry incorporates text from “Time in Arizona” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.