What time zone is Arizona in?
Most of Arizona is on Mountain Standard Time (MST, UTC-7) year-round and does NOT observe Daylight Saving Time. The Navajo Nation in northeastern Arizona does observe DST, while the Hopi Reservation inside it does not.
Arizona Time Zone Split: Exact County Boundaries
Most of Arizona is on Mountain Standard Time (MST) all year and does NOT observe Daylight Saving Time. However, the Navajo Nation in northeastern Arizona DOES observe DST.
98% of Arizona (Phoenix, Tucson, Flagstaff, Yuma, Hopi Tribe)
- Maricopa (Phoenix)
- Pima (Tucson)
- Pinal
- Coconino (Flagstaff outside Navajo lands)
Navajo Nation Reservation in northeastern Arizona
- Apache (Navajo portion)
- Navajo (Navajo portion)
- Coconino (Navajo portion)
💡 Note: A fascinating geographic enclave: the Hopi Reservation sits entirely inside the Navajo Nation and does NOT observe DST, meaning traveling through northern Arizona in summer involves crossing time zones multiple times!
Major Cities & Metro Areas in Arizona
Neighboring States & Time Zones
Check if traveling into adjacent states involves a time zone shift.
Frequently Asked Questions About Arizona Time Zone
Official answers regarding Arizona local clocks, daylight saving rules, and split regions.