It is proper to display the U.S. flag from sunrise to sunset on all days the weather permits. The flag may also be displayed at night if illuminated by a light. It is even more important to display the flag on national holidays and days of importance, including:

Days of Importance to Display the U.S. Flag Holiday/Important Day 2003 2004 New Year's Day Wed./Jan 1 Thurs./Jan 1 Martin Luther King, Jr.'s Birthday Mon./Jan. 20 Mon./Jan. 19 Lincoln's Birthday Wed./Feb. 12 Thurs./Feb. 12 Washington's Birthday Sat./Feb. 22 Sun./Feb. 22 Easter Sunday Sun./April 20 Sun./April 11 Mother's Day Sun./May 11 Sun./May 9 Armed Forces Day Sat./May 17 Sat./May 15 Memorial Day, Observed (Half Staff Until Noon) Mon./May 26 Mon./May 31 Memorial Day Fri./May 30 Sun./May 30 Flag Day Sat./June 14 Mon./June 14 Father's Day Sun./June 15 Sun./June 20 Independence Day Fri./July 4 Sun./July 4 Labor Day Mon./Sept. 1 Mon./Sept. 6 Patriot Day (Not "Patriot's Day" -Half Staff All Day) Thurs./Sept. 11 Sat./Sept. 11 Constitution Day Wed./Sept. 17 Fri. /Sept. 17 Columbus Day, Observed Mon./Oct. 13 Mon./Oct. 11 Columbus Day Sun./Oct. 12 Tues./Oct. 12 Navy Day Mon./Oct. 27 Wed./Oct. 27 Veterans Day Tues./Nov. 11 Thurs./Nov. 11 Thanksgiving Day Thurs./Nov. 27 Thurs./Nov. 25 Christmas Day Thurs./Dec. 25 Sat./Dec. 25 Other Days to Display the U.S. Flag Inauguration Day  - Jan. 20, Once every 4 years Election Days   State and Local Holidays   State Birthday (date admitted to Union) Any Days Proclaimed by the President