Abstract: A crawl space vent cover assembly seals a crawl space vent during cold weather. The assembly includes a panel and an aperture extending through the panel. A line is slidably inserted through the aperture. A hook is coupled to a first end of the line for coupling to a louvered vent coupled to a vent opening. A second end of the line extends from a second surface of the panel. Pulling the second end of the line urges the hook towards a first surface of the panel such that the panel is drawn to abut a wall surface surrounding the vent opening. A retention member is coupled to the line between the second end of the line and the second surface of the panel and is positionable against the second surface of the panel to hold the panel against the wall surface.