It’s a commonly accepted myth: Spiders flock to our houses in the autumn to escape the coming cold of winter. But this notion is just that, a myth. Spiders generally don’t infest your house more in the winter.
Those spiders that you sometimes see scurrying around your house during autumn have likely been living with you all year-round. In fact, less than 5 percent of the spiders you encounter inside your home have set one of their eight feet outside, according to Rod Crawford, Curator of Arachnids at the Burke Museum at the University of Washington.