The U.S. state of Idaho is covered by two time zones, as described below. All locations observe daylight saving time.
The Pacific Time Zone (UTC−08:00, DST UTC−07:00) covers an area roughly coterminous with the Idaho Panhandle or North Idaho:
An easy way to distinguish the line is that it essentially follows the line that divides Washington and Oregon. Idaho counties east of Washington observe Pacific Time, and Idaho counties east of Oregon observe Mountain Time.
The Mountain Time Zone (UTC−07:00, DST UTC−06:00) covers the rest of the state.