Red-eared Sliders bask in groups on logs, fallen trees, and other objects near water (see photo). What becomes of the turtles when it’s cold? "Reptiles do not hibernate but actually brumate, becoming less active but occasionally rising for food or water. They brumate over the winter at the bottom of ponds or shallow lakes. They become inactive, generally, in October, when temperatures fall below 50 °F (10 °C)."