About PST to MST Time
PST covers Los Angeles, San Francisco, Seattle, Las Vegas and Vancouver. MST covers Denver, Salt Lake City, Albuquerque and Calgary.
Working days overlap between 09:00 and 17:00 PST, which is 10:00–18:00 in MST. 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
Mountain Time (Denver) is always 1 hour ahead of Pacific Time (Los Angeles).
- Take the PST time you want to convert.
- Add 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: PST is −8 in winter and −7 in summer (UTC), MST is −7 in winter and −6 in summer.
Examples
A working day in PST, seen from MST:
| PST | MST |
|---|---|
| 09:00 PST | 10:00 MST |
| 12:00 PST | 13:00 MST |
| 15:00 PST | 16:00 MST |
| 18:00 PST | 19:00 MST |
| 21:00 PST | 22:00 MST |
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.
PST to MST Time: frequently asked questions
- What is the time difference between PST and MST?
- MST is 1 hour ahead of PST in standard time (PST is UTC−8, MST is UTC−7). 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 PST in MST?
- 9:00 AM PST is 10:00 AM MST (standard time).
- Where is PST used?
- Pacific Standard Time (UTC−8) is used in the US West Coast (Los Angeles, Seattle).
- Where is MST used?
- Mountain Standard Time (UTC−7) is used in US Mountain (Denver, Phoenix).