Idaho local data guide

Idaho Counties in the Pacific Time Zone

While the majority of Idaho operates on Mountain Time, the state's northern Panhandle region observes Pacific Time. Understanding this split is essential for those relocating to or conducting business across Northern Idaho, as the time zone boundary is defined geographically rather than by county lines alone.

Updated with grounded research as of 2026-10-16.

The short answer

Ten Idaho counties are either entirely or partially located in the Pacific Time Zone. This includes nine counties in the northern Panhandle that are fully within the zone, and Idaho County, which is bisected by the Salmon River—the natural geographic boundary between the Pacific and Mountain time zones.

Key facts

Counties Entirely in Pacific Time
Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, and Shoshone.
Partially in Pacific Time
Idaho County (the portion north of the Salmon River observes Pacific Time).
Time Zone Boundary
The boundary generally follows the Salmon River, which separates the Pacific Time Zone to the north from the Mountain Time Zone to the south.

Geographic Context for Relocation

If you are planning to move to Idaho, recognizing the time zone split is crucial for scheduling, commuting, and local planning. The state is not uniformly on one time standard, which can impact regional business hours, television broadcasts, and virtual meetings if you live near the boundary line.

  • The 'Panhandle' refers to the northernmost region, which is entirely under Pacific Time.
  • Most of the state, including major hubs like Boise and Idaho Falls, operates on Mountain Time.
  • The transition occurs roughly at the Salmon River, which acts as the major dividing line.

The Idaho County Exception

Idaho County is unique because it is the only county in the state that is split between the two time zones. If you are buying property or scouting locations in Idaho County, specifically near Riggins or the Salmon River corridor, it is vital to verify the exact time zone status of the parcel, as the boundary is physical rather than administrative.

Daylight Saving Time Considerations

Both the Pacific and Mountain Time zones in Idaho observe Daylight Saving Time. While you should be aware of the hour difference when crossing the state, you do not need to worry about one region failing to 'spring forward' or 'fall back' compared to the other; the entire state shifts in unison twice a year.

Common questions

Does the entire Idaho Panhandle observe Pacific Time?

Yes, all counties traditionally considered part of the Panhandle (Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, and Shoshone) are entirely within the Pacific Time Zone.

Why is the time zone boundary located at the Salmon River?

The boundary is largely a historical and geographic convention. Because the Salmon River creates a rugged, natural barrier that historically limited travel and communication between the north and south, it served as a logical dividing line for time zones.

Will I experience jet lag moving from Northern Idaho to Southern Idaho?

You will gain or lose an hour, depending on the direction of travel. Moving from the Pacific Time Zone (North) to the Mountain Time Zone (South) effectively moves your clock forward one hour.

Related Idaho questions

  • How does the time difference affect commuting between Idaho cities?
  • Are there any efforts to move the entire state of Idaho to one time zone?
  • Do businesses in Riggins, Idaho, keep specific hours for both time zones?

Sources and verification