MST to PST Converter (Mountain Time to Pacific Time)

PST is 1 hour behind MST.

Mountain Time is the zone of Denver, Salt Lake City, Albuquerque and Boise. Pacific Time lies directly to the west, in Los Angeles, San Francisco, Seattle and Portland. Mountain Time is one hour ahead of Pacific Time, and that gap remains the same throughout the year for these cities.

Arizona makes this pair more interesting than it looks. Most of Arizona stays on Mountain Standard Time all year, so Phoenix is on the same clock as Los Angeles from the second Sunday of March to the first Sunday of November, and one hour ahead of it for the rest of the year.

How to use this tool

1. Pick a date and time in MST. The date matters when daylight saving time is in force.
2. Read the matching time in PST, with both UTC offsets.
3. Use "Use current time" for now, or the tables below for a quick look.

Formula

PST time = MST time − (MST UTC offset) + (PST UTC offset)

The converter looks up both UTC offsets for the actual instant in the saved IANA time zone rules, so daylight saving changes are included automatically.

Example

Worked with the saved rules:

9:00 AM MST on March 2, 2026 = 8:00 AM PST

6:30 PM MDT on August 3, 2026 = 5:30 PM PDT

Time difference through the year

The difference depends on the date when either place moves its clocks. These are the offsets on two reference days, from the saved IANA rules:

Clock changes in 2026

Between these dates the difference shifts by the size of the change.

MST to PST time table

Each hour in Mountain Time with the matching Pacific Time time.

PST to MST time table

Each hour in Pacific Time with the matching Mountain Time time.

Hours that work in both places

Hours (on the January reference day) that fall between 8:00 AM and 8:00 PM in both MST and PST:

What Phoenix and Las Vegas share

During daylight saving time, Phoenix (MST) and Las Vegas (PDT) show the same time, which surprises visitors who drive between the two. In winter Phoenix is an hour ahead. A road trip from Salt Lake City to Las Vegas, by contrast, always crosses a one-hour step.

Phoenix to Los Angeles is therefore a different case from Denver to Los Angeles. If your Mountain Time is for Arizona, check the date carefully: the converter on this page follows the Denver rules, with daylight saving time.

Neighbors across the zone line

The Mountain-Pacific line runs through Idaho and Oregon. Boise is on Mountain Time, but the Idaho panhandle, including Coeur d'Alene, is on Pacific Time. Part of Nevada follows Mountain Time as well: the town of West Wendover uses the clock of nearby Utah.

For a business call, a one-hour gap is small, and most mistakes come from forgetting which zone an invitation names. Write the zone beside the hour, as in "3:00 p.m. Mountain / 2:00 p.m. Pacific".