September 8, 2021 - In the United States, Patriot Day occurs on September 11 of each year in memory of those killed that day in 2001. US Flags and other flags flying with it should be lowered to half staff at sunup on Saturday, September 11, 2021 and raised at sundown the same day. It is permissible to lower them the evening before on September 10.
If you have outdoor flags that cannot be lowered, respect for the day can be shown by tying a black cord or ribbon to the top of the mast.
