About MST to PST Time
MST covers Denver, Salt Lake City, Albuquerque and Calgary. PST covers Los Angeles, San Francisco, Seattle, Las Vegas and Vancouver.
Working days overlap between 10:00 and 18:00 MST, which is 09:00–17:00 in PST. That window is where calls land without anyone working late.
Both regions use daylight saving, so the gap holds for most of the year — except for the week or two each spring and autumn when they switch on different dates.
How it works
Pacific Time (Los Angeles) is always 1 hour behind of Mountain Time (Denver).
- Take the MST time you want to convert.
- Subtract 1 hour.
- Roll the date forward or back if the result crosses midnight.
Neither side changes its clocks relative to the other, so this gap holds all year.
Zone details: MST is −7 in winter and −6 in summer (UTC), PST is −8 in winter and −7 in summer.
Examples
A working day in MST, seen from PST:
| MST | PST |
|---|---|
| 09:00 MST | 08:00 PST |
| 12:00 MST | 11:00 PST |
| 15:00 MST | 14:00 PST |
| 18:00 MST | 17:00 PST |
| 21:00 MST | 20:00 PST |
Meetings usually work best where the two working days overlap. Drag the timeline above to see the overlap for any hour, or use the full time zone converter for any other pair of cities.
MST to PST Time: frequently asked questions
- What is the time difference between MST and PST?
- PST is 1 hour behind MST in standard time (MST is UTC−7, PST is UTC−8). Both zones change clocks on the same US dates, so the 1 hour difference stays the same all year — except in Arizona, which stays on MST year-round.
- What is 9 AM MST in PST?
- 9:00 AM MST is 8:00 AM PST (standard time).
- Where is MST used?
- Mountain Standard Time (UTC−7) is used in the US Mountain (Denver, Phoenix).
- Where is PST used?
- Pacific Standard Time (UTC−8) is used in US West Coast (Los Angeles, Seattle).