Why doesn't Arizona observe Daylight Saving Time?

Arizona does not observe Daylight Saving Time to avoid the extreme heat associated with extended daylight hours in the summer, choosing to remain on Mountain Standard Time year-round.

When do California and Arizona have the same time?

California and Arizona share the same time during the winter months when California falls back to Pacific Standard Time and Arizona stays on Mountain Standard Time.

What is the time difference between California and Arizona during summer?

During summer, California is on Pacific Daylight Time which is one hour ahead of Arizona's Mountain Standard Time.

Do California and Arizona Ever Share the Same Time Zone?

Learn when California and Arizona share the same time zone despite Arizona not observing Daylight Saving Time.

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Sep 24, 2026

Yes, California and Arizona can share the same time zone but only during certain periods of the year. Arizona does not observe Daylight Saving Time (DST), staying on Mountain Standard Time (MST) year-round. Meanwhile, California switches between Pacific Standard Time (PST) in the winter and Pacific Daylight Time (PDT) in the summer. Therefore, when California “falls back” to PST in the winter months, it aligns with Arizona’s MST, making them share the same time.

FAQs & Answers

Why doesn't Arizona observe Daylight Saving Time? Arizona does not observe Daylight Saving Time to avoid the extreme heat associated with extended daylight hours in the summer, choosing to remain on Mountain Standard Time year-round.
When do California and Arizona have the same time? California and Arizona share the same time during the winter months when California falls back to Pacific Standard Time and Arizona stays on Mountain Standard Time.
What is the time difference between California and Arizona during summer? During summer, California is on Pacific Daylight Time which is one hour ahead of Arizona's Mountain Standard Time.

Watch More

If you're interested in time zone differences across the U.S., check out our related videos on how daylight saving time affects other states and how to convert time zones for travel or business.

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