On what date did the S&P 500 reach its post-2008-crash closing low?

The S&P 500 reached its post-2008-crash closing low on March 9, 2009.

The index closed at 676.53 on that date, marking the low point of the market decline associated with the global financial crisis. The fall followed the collapse of the U.S. housing boom, severe losses on mortgage-related assets, the failure or rescue of major financial institutions, and a deepening recession.

The low came several months after the most intense phase of the crisis in autumn 2008. Markets had been battered by the Lehman Brothers bankruptcy, the freezing of credit, and fears about the stability of banks and the wider economy.

After March 9, the S&P 500 began a powerful long-term recovery, although the economy remained weak for some time. The date is therefore often used as the dividing line between the crisis-era bear market and the subsequent bull market.