4am MST is 3:00 am PST
4am MDT is 3:00 am PDT in Pacific Time. That answer holds on every day of the year, because these two zones never drift apart.
What time is 4am MST in PST?
It is 3:00 am. Pacific is 1 hour behind Mountain, so you subtract 1 hour from 4:00 am and the date does not change. 4am is the small hours in Mountain, the deadest part of the night, while 3:00 am is the small hours in Pacific, the deadest part of the night.
The 12 hour clock reuses every number twice, so 4am and 4pm differ only by the meridiem. Converting 4am MST gives 3:00 am PST; converting 4pm MST gives 3:00 pm PST. Losing the am or pm loses half the answer.
4am MST to PST in the hours either side
The four hours before and after 4am, in case the meeting moves. Note that the calendar date does not stay put across this window: it changes partway through, which is exactly where scheduling mistakes come from.
| MST | PST | PST date | Working hours |
|---|---|---|---|
| 12:00 am | 11:00 pm | the previous day | neither |
| 1:00 am | 12:00 am | same day | neither |
| 2:00 am | 1:00 am | same day | neither |
| 3:00 am | 2:00 am | same day | neither |
| 4:00 am (this page) | 3:00 am | same day | neither |
| 5:00 am | 4:00 am | same day | neither |
| 6:00 am | 5:00 am | same day | neither |
| 7:00 am | 6:00 am | same day | neither |
| 8:00 am | 7:00 am | same day | neither |
Is 4am MST a good time to call PST?
No. 3:00 am in Pacific is the small hours, the deadest part of the night. 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 MST to PST?
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 MST is 3:00 am PST in January and in July alike.
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.
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.
4am PST to MST, 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 PST is 5:00 am MST, which is a different reading from the answer above, because the two directions are separate questions. One wrinkle worth knowing: MST and MDT are two names for the same zone, not two zones. Mountain Time reads MST in winter and MDT in summer. When somebody types "mst to pst" they nearly always mean the zone rather than the literal winter offset, so this page resolves MST to America/Denver and PST to America/Los_Angeles and applies whichever offset is genuinely in force on the day.
Questions
- What is 4am MST in PST?
- 3:00 am PST.
- Does 4am MST cross into another date in PST?
- No. It stays on the same calendar day, September 23, 2026.
- Is 4am MST always 3am PST?
- Yes, on every day of the year. These two zones never change their distance from each other at this hour.
- What is 4am MST in UTC?
- 10:00 UTC, because MST is currently UTC-6.
- Can I call Pacific at that hour?
- 3:00 am is outside the 9 to 5 working day in Pacific.
Other hours on this pair
MST to PST full conversion table · PST to MST · 4am PST to MST · All timezone conversions
12 and 24 hour converter · 8 hours from now · Today · Day counter