Statewide coverage
Mountain Time
All of Arizona is legally in Mountain Time.
- Standard time
- MST · UTC-07:00
- Daylight time
- MDT · UTC-06:00
- Daylight saving
- Varies within this zone
- IANA identifiers
- America/Denver, America/Boise, America/Phoenix
AZ time guide
Time Zones in Arizona
Arizona is entirely in the Mountain Time Zone, but daylight-saving practice differs: most of the state does not change clocks while the Navajo Nation does.
1 time zoneOne statewide zoneObserved in part of the area
Time-zone coverage
Daylight saving time in Arizona
Most of Arizona stays on Mountain Standard Time at UTC-07:00 year-round. The Navajo Nation observes daylight saving time; use an address-level lookup near tribal boundaries.
Check an address near a boundary
Time-zone boundaries can follow county lines and local legal definitions rather than a simple east-west line. Check the exact address when timing matters.
Find a time zone by address