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The U.S. state of Idaho is covered by two time zones, as described below. All locations observe daylight saving time.
Contents
The Pacific Time Zone (UTC-08:00, DST UTC-07:00) covers an area roughly coterminous with the Idaho Panhandle or North Idaho:
The Mountain Time Zone (UTC-07:00, DST UTC-06:00) covers the rest of the state.
History
The 1918 Standard Time Act put most of Idaho into the Pacific Time Zone – only the very eastern parts were in the Mountain Time Zone.
For three decades or so in the middle of the twentieth century, Shoshone County had its own time arrangements; it was said to be "on permanent daylight time", so that in the winter the county had the same clock time as Montana and southern Idaho, but in the summer it had the same clock time as Spokane and northern Idaho.
tz database
The tz database version 2016j contains two time zones for Idaho: