Oregon Time Zone Map
Pacific Time; most of Malheur County is Mountain.
Time zones in Oregon
| Zone | IANA | Standard | Daylight | Abbr |
|---|---|---|---|---|
| Pacific Time | America/Los_Angeles | UTC−8 | UTC−7 | PST / PDT |
| Mountain Time | America/Boise | UTC−7 | UTC−6 | MST / MDT |
Oregon is mostly Pacific Time (PST/PDT, UTC−8 in winter, UTC−7 in summer); Portland, Salem, and Eugene are Pacific, while most of Malheur County on the Idaho line uses Mountain Time. The exception is most of Malheur County on the Idaho line, including Ontario, which observes Mountain Time like neighboring Boise.
Crossing the state line
Washington, California, and Nevada share Oregon’s Pacific Time. Idaho is the exception: its southern part, including Boise, is on Mountain Time, which is why Ontario and most of Malheur County follow Boise’s clock.
Frequently asked questions
What time zone is Oregon in?
Oregon is Pacific Time; most of Malheur County is Mountain.
Does Oregon span more than one time zone?
Yes — Oregon covers Pacific Time and Mountain Time, so different parts of the state can be an hour apart in the same calendar day.
What time zone is Portland in?
Portland is on Pacific Time (PST / PDT — UTC−8 in winter, UTC−7 in summer, IANA zone America/Los_Angeles).
Sources: zone boundaries from the U.S. Department of Transportation’s time zone regulations (49 CFR Part 71); offsets and daylight saving rules from the IANA time zone database. See Data Sources for how this site uses them.