Mountain
Mountain Time
Mountain Time covers much of the interior West. Its normal offsets are UTC-07:00 in standard time and UTC-06:00 in daylight time, with the important Arizona exception.
Standard: UTC-07:00Daylight: UTC-06:00Varies within this zone
Time-zone facts
- 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
U.S. places in Mountain Time
14 U.S. states, districts, or territories are wholly or partly covered by this time zone.
States entirely in this zone
States partly in this zone
- Idaho time-zone coverage for Mountain Time
- Kansas time-zone coverage for Mountain Time
- Nebraska time-zone coverage for Mountain Time
- Nevada time-zone coverage for Mountain Time
- North Dakota time-zone coverage for Mountain Time
- Oregon time-zone coverage for Mountain Time
- South Dakota time-zone coverage for Mountain Time
- Texas time-zone coverage for Mountain Time
Daylight saving time
Daylight saving observance varies within Mountain Time. Check the regional exceptions below and use an IANA identifier for software calculations.
- Most of Arizona does not observe daylight saving time and uses Mountain Standard Time at UTC-07:00 throughout the year.
- The Navajo Nation observes daylight saving time, including its Arizona territory; use an address-level lookup near tribal boundaries.
Need the exact zone for an address?
Jurisdiction lists provide an overview, but split states and local exceptions require a precise location lookup.
Check an address