Which date was known as Black Monday during the 1929 Wall Street crash?

Black Monday during the 1929 Wall Street crash occurred on October 28, 1929.

The Dow Jones Industrial Average fell 38.33 points that day, a decline of about 12.8 percent. It was the second major collapse in the dramatic final week of October, following Black Thursday on October 24. The selling reflected weakening confidence after months of speculation and increasingly frantic attempts to exit stocks.

Black Tuesday followed on October 29, when the Dow lost another 30 points, or about 11.7 percent. The two sessions are often discussed together, but they were separate trading days. Black Monday was not the absolute lowest point of the bear market: the Dow continued falling until July 1932, when it reached a low roughly 89 percent below its September 1929 peak. The crash helped deepen the Great Depression, although historians distinguish the market collapse from the broader economic causes of the Depression.