Mountain Time Zone

MST (UTC-7) in winter · MDT (UTC-6) during Daylight Saving Time

MT — Mountain Standard Time
--:--:--
MST UTC-7MDT UTC-6 (DST)

Time Zone Facts

Standard Offset
UTC-7
DST Offset
UTC-6
Standard Abbr
MST
DST Abbr
MDT
IANA Identifier
America/Denver
DST Schedule
2nd Sunday in March → 1st Sunday in November (Arizona excluded)

States in MT — Mountain Time

ColoradoIdaho (most)MontanaNew MexicoUtahWyomingArizona (MST, no DST)

Major Cities in MT

DenverSalt Lake CityAlbuquerqueTucsonColorado SpringsBoiseEl PasoBillings

Daylight Saving Time

Observes DST: 2nd Sunday in March → 1st Sunday in November (Arizona excluded)

Clocks spring forward 1 hour at 2:00 AM on the second Sunday in March, changing from MST (UTC-7) to MDT (UTC-6).

Clocks fall back 1 hour at 2:00 AM on the first Sunday in November, returning from MDT (UTC-6) to MST (UTC-7).

Frequently Asked Questions

What is Mountain Time Zone?
Mountain Time (MT) is the time zone used by the Rocky Mountain states. It switches between Mountain Standard Time (MST, UTC-7) in winter and Mountain Daylight Time (MDT, UTC-6) in summer. It covers Colorado, Utah, Montana, Wyoming, New Mexico, and most of Idaho, with major cities including Denver, Salt Lake City, and Albuquerque.
What is the UTC offset for Mountain Time?
Mountain Standard Time (MST) is UTC-7 — seven hours behind UTC. During Daylight Saving Time (second Sunday in March to first Sunday in November), Mountain Time uses MDT (UTC-6).
Does Arizona observe Mountain Time?
Arizona uses MST (UTC-7) year-round but does NOT observe Daylight Saving Time, except for the Navajo Nation in northeastern Arizona. In summer, when the rest of the Mountain zone shifts to MDT (UTC-6), Arizona stays at UTC-7, effectively aligning with Pacific Daylight Time (PDT).
What states are in the Mountain Time Zone?
States in Mountain Time: Colorado, Idaho (most), Montana, Nevada (eastern tip), New Mexico, Utah, Wyoming. Arizona uses MST year-round without DST. Parts of: Kansas (west), Nebraska (west), North Dakota (west), South Dakota (west), Texas (west tip, El Paso).
How many hours is Mountain Time behind Eastern Time?
Mountain Time (MT) is always 2 hours behind Eastern Time (ET). MST (UTC-7) is 2 hours behind EST (UTC-5), and MDT (UTC-6) is 2 hours behind EDT (UTC-4). Both zones observe DST on the same schedule.

Mountain Time Converters & Related Zones

MST to ESTEST to MSTEastern Time ZoneCentral Time ZonePacific Time ZoneUS Time Zone MapTime in DenverTime in Arizona
Mountain Time Zone data sourced from IANA Time Zone Database (America/Denver). Arizona uses America/Phoenix (no DST).