Idaho local data guide

Time Zones in Idaho

Idaho is split between two time zones, a unique geographical quirk that affects travel and business operations. The majority of the state, including the southern and central regions, operates on Mountain Time, while the northern Panhandle observes Pacific Time. Both zones participate in Daylight Saving Time.

Updated with grounded research as of 2026-10-17.

The short answer

Idaho is divided into two time zones: the Mountain Time Zone and the Pacific Time Zone. The dividing line generally separates the northern Idaho Panhandle from the rest of the state. Most of Idaho, including major hubs like Boise and Idaho Falls, operates on Mountain Time, while the northernmost counties observe Pacific Time.

Key facts

Mountain Time Zone
Covers the majority of the state, including Boise, Idaho Falls, and Twin Falls.
Pacific Time Zone
Covers the Idaho Panhandle (typically north of the Salmon River).
Daylight Saving Time
Observed across the entire state of Idaho.

Geographic Distribution

The state's time zone boundary is primarily defined by the Salmon River. Areas located to the north of this geographic feature generally align with the Pacific Time Zone, while communities to the south and east operate on Mountain Time.

  • Mountain Time: Includes Southern Idaho, the Treasure Valley, and Eastern Idaho.
  • Pacific Time: Includes the Panhandle region, such as Coeur d'Alene, Sandpoint, and Moscow.

Practical Implications for Residents

If you are moving to Idaho or planning travel between cities, it is important to verify which time zone your destination falls within. Business hours, meetings, and regional services can be impacted when crossing this internal time boundary.

Residents living near the transition point often manage schedules across both zones, particularly those with professional or family connections spanning North and South Idaho.

Daylight Saving Time Policy

Idaho adheres to the federal policy regarding Daylight Saving Time (DST). Regardless of which time zone a specific county falls under, all regions of the state shift clocks forward in the spring and back in the fall in synchronization with the rest of the United States.

Common questions

Why is Idaho divided into two time zones?

The split is largely historical and geographic. The rugged terrain of central Idaho, specifically the Salmon River, historically isolated the northern Panhandle from the southern capital, leading to tighter economic and transit ties with neighboring Washington and the Pacific Northwest rather than Boise.

Which time zone does the state capital fall into?

Boise, the capital of Idaho, is located in the Mountain Time Zone.

Related Idaho questions

  • What are the major cities in North Idaho?
  • How do I determine the time zone for a specific Idaho county?
  • Does the time zone split impact state government operations?

Sources and verification