3rd Monday in February. Not all states. Offically this holiday marks George Washington’s birthday in 1796, the last year of his presidency.
A regional holiday in Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, District of Columbia, Hawaii, Idaho, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New York, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wyoming.
Information provided by www.officeholidays.com