Compare MST vs PST
See the current MST and PST time difference, understand DST changes, and find the best hours to schedule meetings across both zones.
How to Find the Time Difference Between MST and PST
Open the MST vs PST converter page: Go to https://www.xconvert.com/time-converter/mst-vs-pst to load a comparison grid with MST and PST already shown as separate rows on a 24-hour timeline. This view is useful when you need to schedule a support handoff between a Denver-based operations team and a Los Angeles client, because you can immediately see that the U.S. Mountain and Pacific zones are close but not identical.
Add relevant comparison cities with the + Add City button: Click + Add City and add places such as Phoenix, Los Angeles, and Seattle if you are coordinating logistics, West Coast sales calls, or software releases across the U.S. West. Phoenix is especially important because it stays on Mountain Standard Time year-round and does not observe daylight saving time, while Los Angeles and Seattle follow Pacific Time with seasonal clock changes.
Drag across the grid to select a meeting window: Click Select, then drag across the MST row from 9:00 AM to 11:00 AM MST to highlight that range in purple; the PST row will show the equivalent as 8:00 AM to 10:00 AM PST on the same date. This is a practical way to confirm that a 9 AM operations meeting in Salt Lake City or Albuquerque starts at 8 AM for teams in California, which can affect attendance for sales, media, and engineering teams that begin work later on the Pacific coast.
Export the selected time for sharing: After selecting the range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link depending on how your team works. For example, an ICS file is useful for a distributed field-services team, while a Share link or Gmail option works well when sending a proposed MST-to-PST support window to a client so everyone sees the meeting in their own local time automatically.
MST vs PST Offset Explained
MST is 1 hour ahead of PST. In standard time, Mountain Standard Time = UTC-7 and Pacific Standard Time = UTC-8. That means when it is 9:00 AM MST, it is 8:00 AM PST; when it is 5:00 PM MST, it is 4:00 PM PST.
The seasonal detail matters because these labels refer specifically to standard time, not the broader regional time zones. MST is used year-round in places such as most of Arizona and is also the winter standard time in states like Colorado, Utah, Wyoming, and New Mexico. PST is the winter standard time for places such as California, Washington, and Nevada, and it changes to daylight time in spring and summer.
In the United States, daylight saving time in 2025 begins on Sunday, March 9, 2025, when clocks move forward at 2:00 AM local time, and ends on Sunday, November 2, 2025, when clocks move back at 2:00 AM local time. During that DST period, Pacific locations that normally use PST switch to PDT (UTC-7), which means they temporarily match MST (UTC-7) exactly. In practical terms, a city staying on MST year-round, such as Phoenix, has no time difference from Los Angeles during daylight saving months, but is 1 hour ahead of Los Angeles during standard time.
This distinction is important for real scheduling. If you are booking a winter call between Phoenix and San Francisco, Phoenix is 1 hour ahead; if you book the same recurring call in June, both cities align at the same clock time because San Francisco is on PDT. That seasonal shift affects customer support coverage, airline departures, construction project coordination, and remote standups for companies with teams split between Arizona and the U.S. West Coast.
For business use, the 1-hour gap is small but still operationally important. A 10:00 AM MST vendor meeting reaches Pacific participants at 9:00 AM PST, which is usually manageable for finance, healthcare administration, SaaS support, and legal teams. However, an 8:00 AM MST start becomes 7:00 AM PST, which may be too early for external clients, media teams, or retail partners on the West Coast.
Frequently Asked Questions
What is the exact time difference between MST and PST?
MST is exactly 1 hour ahead of PST when both are in standard time. MST is UTC-7 and PST is UTC-8, so if it is 3:00 PM in MST, it is 2:00 PM in PST. This is the standard winter relationship used for many U.S. scheduling needs.
Is MST always 1 hour ahead of PST?
No, not in every real-world situation throughout the year, because Pacific locations often switch to daylight saving time while some MST locations do not. For example, Phoenix stays on MST all year, but Los Angeles changes from PST (UTC-8) to PDT (UTC-7) from March 9, 2025 to November 2, 2025, so during that period Phoenix and Los Angeles are on the same clock time.
Why do Phoenix and Los Angeles sometimes have the same time?
Phoenix is in Arizona, and most of Arizona does not observe daylight saving time, so it remains on MST (UTC-7) all year. Los Angeles uses Pacific Time, which is PST (UTC-8) in winter and PDT (UTC-7) in summer, so from mid-March to early November the two cities match exactly. This is one of the most common sources of confusion for travelers, recruiters, and remote teams working across the U.S. Southwest and West Coast.
When do MST and PST change for daylight saving time?
The standard U.S. daylight saving schedule for 2025 starts on March 9, 2025 and ends on November 2, 2025, with the clock change occurring at 2:00 AM local time. Locations that observe DST move from standard time to daylight time in March and return in November, but places that stay on MST year-round, such as most of Arizona, do not change at all. That means the practical difference between an MST location and a Pacific location can shift depending on the month and the specific city.
How do I convert 9 AM MST to PST?
To convert 9:00 AM MST to PST, subtract 1 hour, which gives 8:00 AM PST. This is useful for setting internal meetings, webinar start times, and transportation schedules between Mountain-region cities and the West Coast. If the Pacific location is on PDT rather than PST, then you should verify the date because the difference may disappear entirely.
Is Denver on MST and Los Angeles on PST year-round?
No. Denver follows the Mountain Time Zone and uses MST in winter and MDT in summer, while Los Angeles uses PST in winter and PDT in summer. If you are comparing the labels MST vs PST specifically, you are comparing winter standard offsets of UTC-7 and UTC-8, but actual city-to-city planning depends on the date because both cities may be on daylight time later in the year.
What is the best meeting time for teams working across MST and PST?
A practical overlap for many office teams is 10:00 AM to 2:00 PM MST, which corresponds to 9:00 AM to 1:00 PM PST during standard time. That window usually fits software development standups, customer success calls, and regional sales meetings without pushing Pacific participants too early or Mountain participants too late. If one side is in Arizona and the other is in California during summer, the overlap is even easier because both locations may share the same local time.
Does the MST vs PST difference affect flights and travel planning?
Yes, especially for same-day business trips and short-haul flights between cities such as Phoenix, Las Vegas, Los Angeles, Denver, and San Diego. A one-hour shift can change perceived departure and arrival times, airport transfer planning, and meeting readiness after landing. Travelers should always check the date and city pair, because Arizona’s year-round MST can make itineraries look inconsistent compared with California or Nevada during daylight saving months.