Idaho Code § 73-108: Holidays enumerated.

Holidays, within the meaning of these compiled laws, are:

Every Sunday;

January 1 (New Year’s Day);

Third Monday in January (Martin Luther King, Jr.-Idaho Human Rights Day);

Third Monday in February (Washington’s Birthday);

Last Monday in May (Memorial Day);

July 4 (Independence Day);

First Monday in September (Labor Day);

Second Monday in October (Columbus Day);

November 11 (Veterans Day);

Fourth Thursday in November (Thanksgiving Day);

December 25 (Christmas);

Every day appointed by the President of the United States, or by the governor of this state, for a public fast, thanksgiving, or holiday.

Any legal holiday that falls on Saturday, the preceding Friday shall be a holiday and any legal holiday enumerated herein other than Sunday that falls on Sunday, the following Monday shall be a holiday.