Why Is Arizona an Hour Behind Mountain Standard Time (MST)?

Learn why Arizona does not observe Daylight Saving Time and how it affects its time zone alignment with MST and PST.

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Arizona does not observe Daylight Saving Time except for the Navajo Nation. Therefore, for part of the year, Arizona aligns with Pacific Standard Time (PST), which is one hour behind Mountain Standard Time (MST). This practice helps avoid summer months' extended evenings, making it simpler for Arizona residents to manage their schedules.

FAQs & Answers

  1. Does Arizona observe Daylight Saving Time? Arizona does not observe Daylight Saving Time except for the Navajo Nation, which follows DST along with most of the U.S.
  2. Why is Arizona aligned with Pacific Standard Time part of the year? Because Arizona does not shift clocks forward during DST, it effectively aligns with Pacific Standard Time, which is one hour behind Mountain Standard Time.
  3. Which part of Arizona observes Daylight Saving Time? The Navajo Nation within Arizona observes Daylight Saving Time, unlike the rest of the state.

Watch More

For more information on how different U.S. states handle time changes and Daylight Saving Time, check out our videos explaining time zone boundaries and the history of DST observance across the country.

  1. How Does Arizona Time Work Without Daylight Saving Time? Learn why Arizona mostly stays on Mountain Standard Time year-round and how the Navajo Nation observes Daylight Saving Time.
  2. Why Does Arizona Have a Different Time Zone? Explanation of Arizona’s Time Difference Discover why Arizona’s time differs from other states due to its unique non-observance of Daylight Saving Time, except for the Navajo Nation.
  3. Is Arizona on MST or PST During Daylight Saving Time? Learn why Arizona stays on Mountain Standard Time (MST) year-round and how the Navajo Nation observes Daylight Saving Time.
  4. Why Does Arizona Stay an Hour Behind? Understanding Its Time Zone and Daylight Saving Policy Discover why Arizona doesn’t observe daylight saving time and remains an hour behind Pacific Time during DST months.
  5. Does Arizona Observe Daylight Saving Time or Stay on Standard Time Year-Round? Learn why Arizona stays on Mountain Standard Time year-round and the exception of the Navajo Nation's Daylight Saving Time observance.
  6. Why Is Arizona 3 Hours Behind Eastern Standard Time (EST)? Learn why Arizona stays 3 hours behind EST due to not observing Daylight Saving Time, remaining on Mountain Standard Time year-round.
  7. Why Does Arizona Use a Different Time Zone and Skip Daylight Saving Time? Learn why Arizona stays on Mountain Standard Time year-round by not observing Daylight Saving Time to avoid extreme summer heat.