4am PST is 5:00 am MST
4am PDT is 5:00 am MDT in Mountain Time. That answer holds on every day of the year, because these two zones never drift apart.
What time is 4am PST in MST?
It is 5:00 am. Mountain is 1 hour ahead of Pacific, so you add 1 hour to 4:00 am and the date does not change. 4am is the small hours in Pacific, the deadest part of the night, while 5:00 am is early morning in Mountain, alarms, commutes and the first coffee.
The 12 hour clock reuses every number twice, so 4am and 4pm differ only by the meridiem. Converting 4am PST gives 5:00 am MST; converting 4pm PST gives 5:00 pm MST. Losing the am or pm loses half the answer.
4am PST to MST in the hours either side
The four hours before and after 4am, in case the meeting moves. The whole window stays on the same day in Mountain, so only the hour changes.
| PST | MST | MST date | Working hours |
|---|---|---|---|
| 12:00 am | 1:00 am | same day | neither |
| 1:00 am | 2:00 am | same day | neither |
| 2:00 am | 3:00 am | same day | neither |
| 3:00 am | 4:00 am | same day | neither |
| 4:00 am (this page) | 5:00 am | same day | neither |
| 5:00 am | 6:00 am | same day | neither |
| 6:00 am | 7:00 am | same day | neither |
| 7:00 am | 8:00 am | same day | neither |
| 8:00 am | 9:00 am | same day | MST only |
Is 4am PST a good time to call MST?
No. 5:00 am in Mountain is early morning, alarms, commutes and the first coffee. Nobody is taking that call. The zones are 1 hour apart, so the nearest sensible slot is a different hour entirely.
Does daylight saving change 4am PST to MST?
Not for this conversion. Sampled at 4am on every day of 2026, the gap between these two zones comes out the same every single time, so 4am PST is 5:00 am MST in January and in July alike.
Pacific Time is currently on PDT and changes next on Sunday, November 1, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC-7 to UTC-8.
Mountain Time is currently on MDT and changes next on Sunday, November 1, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC-6 to UTC-7.
4am MST to PST, the other way round
Running the question the other way is a different conversion, not a mirror image, because the two zones can be in different daylight saving states on the same date. 4am MST is 3:00 am PST, which is a different reading from the answer above, because the two directions are separate questions. One wrinkle worth knowing: PST and PDT are two names for the same zone, not two zones. Pacific Time reads PST in winter and PDT in summer. When somebody types "pst to mst" they nearly always mean the zone rather than the literal winter offset, so this page resolves PST to America/Los_Angeles and MST to America/Denver and applies whichever offset is genuinely in force on the day.
Questions
- What is 4am PST in MST?
- 5:00 am MST.
- Does 4am PST cross into another date in MST?
- No. It stays on the same calendar day, September 23, 2026.
- Is 4am PST always 5am MST?
- Yes, on every day of the year. These two zones never change their distance from each other at this hour.
- What is 4am PST in UTC?
- 11:00 UTC, because PST is currently UTC-7.
- Can I call Mountain at that hour?
- 5:00 am is outside the 9 to 5 working day in Mountain.
Other hours on this pair
PST to MST full conversion table · MST to PST · 4am MST to PST · All timezone conversions
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