Abstract: A method and apparatus for enclosing air entry sections of an evaporative cooler. The cooler cover is fabricated as cooperating planar elements having interlockable segments along juxtaposed edges. The panels interlock to tightly envelope the cooler when the cover is assembled and when the final two juxtaposed edges of the assembled cover are brought together. An insulative pad on the interior face of each panel seals the underlying air entry section of the cooler against inclement weather.