Convert PST to MST
See the 1-hour difference between Pacific Standard Time and Mountain Standard Time, compare hours side by side, and plan meetings fast.
How to Convert PST to MST
Open the PST to MST converter: Go to https://www.xconvert.com/time-converter/pst-to-mst-converter. The page is built for people comparing Pacific Time and Mountain Time at a glance, which is useful when scheduling calls between teams in California, Washington, Arizona, Colorado, Utah, or New Mexico without manually counting hours.
Add comparison cities relevant to your schedule: Click “+ Add City” and add specific places such as Los Angeles, Phoenix, and Denver. This is especially helpful for software teams coordinating between West Coast headquarters, Mountain-region operations offices, and Arizona-based staff, because Phoenix does not observe daylight saving time while Denver does.
Drag across the grid to select a meeting window: Use the “Select” button if needed, then drag across the colored timeline on the PST row to highlight a range in purple, such as 9:00 AM to 11:00 AM PST. The grid will show the corresponding Mountain Time window immediately; in standard time that becomes 10:00 AM to 12:00 PM MST, which helps confirm whether a sales call, support handoff, or project standup lands inside normal work hours.
Export and share the selected time range: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is practical when a distributed team needs the same meeting block added to calendars automatically, or when you want to send a client a shareable link showing the exact PST-to-MST conversion for a specific date.
Understanding the PST to MST Time Difference
PST is exactly 1 hour behind MST. Pacific Standard Time is UTC-8, while Mountain Standard Time is UTC-7. That means when it is 9:00 AM PST, it is 10:00 AM MST, and when it is 5:00 PM PST, it is 6:00 PM MST.
The seasonal detail matters because many people use “PST” and “MST” loosely when they really mean Pacific Time and Mountain Time year-round. During the standard-time period, the 1-hour difference is correct: PST (UTC-8) versus MST (UTC-7). In the United States, standard time typically runs from the first Sunday in November to the second Sunday in March; for example, in the 2025-2026 cycle, standard time begins November 2, 2025 and ends March 8, 2026.
Daylight saving time changes the labels in most locations. Areas observing Pacific Time switch from PST to PDT (UTC-7), and most Mountain Time areas switch from MST to MDT (UTC-6). In regions where both sides observe DST, the gap usually remains 1 hour, but Arizona creates an important exception because most of the state stays on MST all year and does not switch to MDT.
That Arizona exception changes the practical comparison by month. From roughly mid-March to early November, places like Los Angeles are on PDT (UTC-7) while Phoenix remains on MST (UTC-7), so the difference becomes 0 hours during that period. From early November to mid-March, Los Angeles returns to PST (UTC-8) and Phoenix remains MST (UTC-7), so the difference returns to 1 hour.
This distinction matters for real scheduling. A logistics company with dispatch in Los Angeles and warehouse operations in Phoenix may see matching local clocks in summer but a 1-hour gap in winter. By contrast, a company coordinating between San Francisco and Denver will generally still see a 1-hour separation all year because both regions move their clocks on the same DST transition dates.
Best Times for Calls and Meetings Between PST and MST
For standard business scheduling, the easiest overlap is the full workday offset: 9:00 AM to 5:00 PM PST = 10:00 AM to 6:00 PM MST. This works well for internal meetings between Pacific-based product teams and Mountain-based operations, finance, healthcare administration, or customer success teams because both sides stay within normal office hours.
A strong morning collaboration window is 8:00 AM to 10:00 AM PST = 9:00 AM to 11:00 AM MST. This is useful for daily standups, engineering syncs, and support escalations because Mountain Time participants are already fully into the workday while Pacific Time participants are not starting unusually early.
A mid-day meeting block that often works best is 9:00 AM to 11:00 AM PST = 10:00 AM to 12:00 PM MST. This is one of the most practical windows for client presentations, recruiting interviews, and cross-functional planning because it avoids the earliest Pacific hours and the lunch period for many Mountain offices.
For later-day coordination, 1:00 PM to 3:00 PM PST = 2:00 PM to 4:00 PM MST is a reliable option. This window is common for sales pipeline reviews, legal check-ins, and regional management calls where West Coast teams need time to prepare in the morning and Mountain teams still want to finish before end-of-day wrap-up.
The least convenient times are usually very early Pacific mornings or late Mountain afternoons. For example, 7:00 AM PST = 8:00 AM MST, which may be too early for some teams, while 4:30 PM PST = 5:30 PM MST, which pushes Mountain participants close to or past standard office closing time. If you are booking recurring meetings, the converter is especially useful for checking whether the chosen slot still works after the March and November DST transitions.
If one of the “MST” participants is actually in Arizona, verify the city rather than relying only on the abbreviation. A meeting set for 9:00 AM Pacific can map to 9:00 AM in Phoenix during daylight time but 10:00 AM in Phoenix during standard time, which affects recurring vendor calls, telehealth scheduling, and regional field-service dispatch.
Frequently Asked Questions
What is the time difference between PST and MST?
PST is 1 hour behind MST. Specifically, Pacific Standard Time is UTC-8 and Mountain Standard Time is UTC-7, so MST is always one hour ahead during standard time.
In practical terms, if your office in California is working at 9:00 AM PST, a colleague in a standard-time Mountain location is already at 10:00 AM MST. This is why teams often schedule shared meetings in late morning Pacific time to avoid pushing Mountain participants too late into the day.
When is 9 AM PST in MST?
9:00 AM PST is 10:00 AM MST. This is the standard conversion used during the part of the year when Pacific locations are on standard time and Mountain standard-time locations are also on standard time.
For recurring meetings, always check the exact city as well as the date. If the other side is in Phoenix, the answer can differ seasonally because Phoenix stays on MST year-round, while Pacific locations switch between PST and PDT.
Does the difference between PST and MST change during daylight saving time?
Yes, it can change depending on which specific locations you mean by “PST” and “MST.” If you are comparing regions that both follow the usual U.S. clock changes, the practical gap generally remains 1 hour, because Pacific shifts from PST to PDT and Mountain shifts from MST to MDT on the same dates.
The main exception is Arizona, where most of the state does not observe daylight saving time. From the second Sunday in March to the first Sunday in November, Pacific daylight time and Arizona’s year-round MST are both UTC-7, so the difference becomes 0 hours for cities like Los Angeles and Phoenix during that period.
What is the best meeting time between PST and MST?
A highly workable meeting window is 9:00 AM to 11:00 AM PST, which converts to 10:00 AM to 12:00 PM MST. This range is late enough for Pacific teams to be settled in and early enough for Mountain teams to avoid lunch conflicts and late-afternoon fatigue.
Another strong option is 1:00 PM to 3:00 PM PST = 2:00 PM to 4:00 PM MST. That block is often used for client reviews, project approvals, and regional coordination because it gives both sides enough same-day preparation time.
Is MST always one hour ahead of PST?
During true standard time, yes: MST is always 1 hour ahead of PST. The exact offsets are UTC-7 for MST and UTC-8 for PST, making the calculation straightforward.
However, many people use these abbreviations casually all year even when the local zone has changed to daylight time. If you are booking travel, sending calendar invites, or coordinating field teams in Arizona, California, or Colorado, use the city-based converter view to avoid mistakes caused by seasonal clock changes.
Why does Phoenix sometimes match Pacific Time?
Phoenix stays on Mountain Standard Time all year and does not switch to daylight saving time. During the daylight-saving season, Pacific locations such as Los Angeles and San Francisco move to PDT (UTC-7), which matches Phoenix’s UTC-7 clock exactly.
That means a summer meeting at 2:00 PM in Los Angeles is also 2:00 PM in Phoenix, even though Phoenix is normally thought of as being in the Mountain zone. In winter, when Pacific returns to PST (UTC-8), Phoenix becomes 1 hour ahead again.
How do I schedule a recurring call between Pacific and Mountain teams without DST mistakes?
Use the converter on the exact date range for the meetings instead of assuming the same offset all year. On xconvert’s grid, choose the meeting date with the top date picker, add real cities like Seattle, Denver, or Phoenix, and drag the intended meeting block so you can verify whether the local times stay consistent across March and November transitions.
This is especially important for remote teams in software, customer support, healthcare administration, and transportation, where missed handoffs can affect service levels. Exporting the selected slot as ICS or sending it through Google Calendar helps each participant see the event in their own local time automatically.