Monday will be an especially noteworthy day on America’s calendar — and it’s one that will be marked by various closings, including that of financial markets.

U.S. stock markets will be closed on Monday, Jan. 20, in observance of the Martin Luther King Jr. Day holiday. The Nasdaq and New York Stock Exchange will both be closed on the federal holiday but will reopen for regular trading hours on Tuesday, Jan. 21.

Here's what you need to know about whether U.S. stock markets will be open on Martin Luther King Jr., Day this year.