timeinusa.net

PST to MST — Pacific to Mountain Time

Mountain Time is 1 hour ahead of Pacific Time, in every season of the year.

The conversion rule

Add 1 hour to Pacific Time to get Mountain Time. 12:00 PM PST is 1:00 PM MST. Both zones spring forward and fall back on the same dates, so the hour never changes.

9:00 AM–4:00 PM PT / 10:00 AM–5:00 PM MT gives seven overlapping office hours between the Coast and the Rockies.

Except for Arizona: Phoenix stays on MST all year, and during daylight saving its clocks read identical to California's PDT — the one-hour difference disappears.

PST to MST conversion chart

Pacific (PST/PDT)Mountain (MST/MDT)
12:00 AM (midnight)1:00 AM
1:00 AM2:00 AM
2:00 AM3:00 AM
3:00 AM4:00 AM
4:00 AM5:00 AM
5:00 AM6:00 AM
6:00 AM7:00 AM
7:00 AM8:00 AM
8:00 AM9:00 AM
9:00 AM10:00 AM
10:00 AM11:00 AM
11:00 AM12:00 PM (noon)
12:00 PM (noon)1:00 PM
1:00 PM2:00 PM
2:00 PM3:00 PM
3:00 PM4:00 PM
4:00 PM5:00 PM
5:00 PM6:00 PM
6:00 PM7:00 PM
7:00 PM8:00 PM
8:00 PM9:00 PM
9:00 PM10:00 PM
10:00 PM11:00 PM
11:00 PM12:00 AM (midnight, next day)

Reverse direction: MST to PST (subtract 1 hour). Related: PST to EST, PST to CST, PST to AKST.

Frequently asked questions

Is Denver always an hour ahead of Los Angeles?

Yes — 1 hour year-round, since both observe DST on the same schedule. Phoenix, though, matches Los Angeles exactly from March to November because Arizona skips DST.

What is 4:00 PM PST in MST?

5:00 PM MST, the end of the Mountain business day.

When is 9:00 AM MST in Pacific Time?

8:00 AM PST — Denver's first hour arrives before most Pacific offices open.