PST to MST Time Zone Converter
PST to MST converts US Pacific Time to US Mountain Time — the zone covering Denver, Salt Lake City, and Phoenix. Mountain is just 1 hour ahead of Pacific, and because both zones change their clocks on the same dates, that 1-hour gap holds all year. The converter handles the daylight saving switch for you.
Enter a date and time to convert.
Daylight saving is applied automatically for the date you pick. Labels like PST/EST name the zone (Pacific/Eastern); the real abbreviation shifts to PDT/EDT during daylight saving, and gmt here means London (GMT in winter, BST in summer) while utc stays fixed.
The time difference
US Mountain Time is 1 hour ahead of US Pacific Time, every day of the year. Just add an hour to a Pacific clock: 8 AM in Seattle is 9 AM in Denver, and 3 PM in San Francisco is 4 PM in Salt Lake City. It's the easiest US conversion to do in your head.
A worked example
Take 9:00 AM Pacific. On January 15, 2026 that's 10:00 AM Mountain, and on July 15, 2026 it's again 10:00 AM Mountain. The clock result is the same all year, so 10 AM Mountain holds for a 9 AM Pacific start whatever the season.
Daylight saving & the abbreviation caveat
The slugs read PST and MST — the winter names. From spring to fall both zones shift to daylight time and become PDT and MDT, which is why locals just say "PT" and "MT." Both switch on the same dates (spring forward March 8, fall back November 1 in 2026), so the 1-hour gap never breaks. One thing to note: most of Arizona doesn't observe daylight saving, but the converter follows whichever Mountain rule applies to the date you pick, so the result stays correct.
When you'll use it
Useful for coordinating with a Denver or Salt Lake City office, timing a flight into a Mountain-zone airport, or catching a ski-resort webcam or event that runs on Mountain time. Since the gap is only an hour, it's easy to forget — but that one hour is exactly what trips people up on early morning calls.
Frequently asked questions
How many hours ahead is MST from PST?
Mountain Time is 1 hour ahead of Pacific Time. When it's 9:00 AM in Los Angeles, it's 10:00 AM in Denver. It's the smallest gap between US mainland zones and it holds all year.
Does the PST to MST difference change with the seasons?
No. Pacific and Mountain move to daylight saving on the same dates, so the 1-hour difference never changes. The names shift to PDT and MDT in summer, but the gap stays at 1 hour.
What is 9 AM Pacific in Mountain Time?
10:00 AM Mountain. Add 1 hour to any Pacific time to get Mountain, on the same day.