The Dow Jones Industrial Average reached its 2009 low during the global financial crisis on March 9, 2009.
The index closed at 6,547.05 that day, its lowest closing level since April 1997. The decline followed the collapse of the United States housing boom, failures and rescues across the financial sector, and severe stress in credit markets after Lehman Brothers filed for bankruptcy in September 2008.
From that low, the Dow began a long recovery as governments and central banks introduced emergency measures, including financial rescues, fiscal stimulus, and exceptionally low interest rates. The exact market bottom differed by index and country, so March 9 is specifically the widely cited closing low for the Dow.
The date is not the same as the 2008 crash’s most dramatic individual sessions. It marks the end point of a prolonged bear market rather than a single-day collapse.