The article presents the results of a palynological study conducted at the Middle Paleolithic site of Chagyrskaya Cave (Altai). Sediments containing the technocomplex of the Sibiryachikha facies of the Altai Middle Paleolithic accumulated at the end of MIS 4 which corresponds with the nal stage of the Ermakovo glaciation. The results of the palynological analysis indicate that during the period in question, predominantly steppe landscapes existed in dry, cold climate conditions. © 2013, Siberian Branch of Russian Academy of Sciences, Institute of Archaeology and Ethnography of the Siberian Branch of the Russian Academy of Sciences.