January 15 - Birthday of Martin Luther King Jr. (traditional)
January 20 - Inauguration Day
February 1 - National Freedom Day (signing of 13th Am.; pres. procl)
February 2 - Groundhog Day
February 12 - Lincoln's Birthday
February 14 - Valentine's Day
Third Monday in February - President's Day (observed)
February 22 - Washington's Birthday
Second Sunday in March- Daylight Saving Time begins
March 17 - Saint Patrick's Day
April 1 - April Fool's Day
April 15 - Federal Income Taxes are due (or, if a weekend, on the next legal day)
April 22 - Earth Day
Last Wednesday in April - Administrative Professionals' Day
Last Friday in April - Arbor Day (date varies depending on the climate of the state.)
May 1 - Loyalty Day
Second Sunday in May - Mother's Day
Third Saturday in May - Armed Forces Day
Last Monday in May - Memorial Day
June 14 - Flag Day
Third Sunday in June - Father's Day
July 4 - Independence Day
Fourth Sunday in July - Parents' Day
First Monday in September - Labor Day
First Sunday after Labor Day - Grandparents Day
September 17 - Citizenship Day
Second Monday in October - Columbus Day (observed)
October 12 - Columbus Day (traditional)
October 24 - United Nations Day
October 29, 2006 - Daylight Saving Time ends (2006 only, see first Sunday in November)
October 31 - Halloween
First Sunday in November - Daylight Savings Time ends (beginning in 2007)
First Tuesday after first Monday in November - Election Day
November 11 - Veterans' Day. The federal government still observes Veterans' Day on November 11. Incidentally, the state of Washington does also, because it was admitted to statehood on November 11 1889.
Fourth Thursday of November - Thanksgiving Day
December 15 - Bill of Rights Day
December 25 - Christmas Day
December 26 - Christmas Day (federal observed)