Time zone · Americas
MST
Mountain Standard Time
Mountain Standard Time stretches across much of the central Rocky Mountain corridor, linking cities from Denver to Edmonton. Most of it shifts forward in spring, though pockets such as Creston and Fort Nelson stay put year-round at standard time.
Saturday, May 30, 2026
Current offset
UTC-07:00
Standard · MST
Daylight saving
Not observed
Year-round standard time
IANA zones
4
None observe daylight saving
DST offset
—
No summer variant
About MST
A fixed, year-round offset.
Mountain Standard Time stretches across much of the central Rocky Mountain corridor, linking cities from Denver to Edmonton. Most of it shifts forward in spring, though pockets such as Creston and Fort Nelson stay put year-round at standard time.
IANA zones · the technical identifiers
The 4 zones that resolve to MST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Where MST is used
2 countries.
Same offset · UTC-07:00
Other zones at UTC-07:00 right now.
These named zones share MST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Frequently asked questions
Common questions about MST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Which MST zones do not observe daylight saving?
- America/Creston, America/Dawson_Creek, and America/Fort_Nelson all stay at standard offset throughout the year.
- Is Boise always the same time as Denver?
- Yes, Boise and Denver remain identical all year—both shift together with daylight saving.
- Where exactly does MST apply in Canada?
- Canadian MST zones include Boise’s neighbours across the border, such as Edmonton, Cambridge Bay, Creston, Dawson Creek, and Fort Nelson.
- Does Mexico have zones in MST?
- Yes, Ciudad Juárez runs on the same clock as the rest of the MST corridor.
- How do the non-DST zones affect the region?
- Because Creston, Dawson Creek, and Fort Nelson keep standard time year-round, parts of MST effectively run an hour behind daylight-saving neighbours during summer.
- Do MST dates change every year?
- Not in this region: clocks shift forward in March and back in November, the same North American pattern used by Denver and Edmonton.
- Why do some American cities leave MST for another zone?
- Crossing the Rockies often means entering Pacific or Central time; MST is really the mountain corridor itself.
- Which representative zone is used on the clock?
- America/Boise is shown, so the hero matches the current daylight-saving offset used by the majority of the region.
Free · Developer API
Time, as JSON.
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