Abstract: A post protection system for extending the useful life of wooden posts positioned below ground level. The post protection system includes an elongate sleeve having a plurality of side walls, an upper opening, a floor and an interior cavity. A plurality of vertical ribs extend inwardly from the side walls toward the interior cavity for engaging the outside surface of the wooden post. A seal is positionable about the upper end of the sleeve for enclosing the upper opening with the wooden post positioned within. Ventilation into the interior cavity is allowed about the lower end of the seal through the grooves created by the vertical ribs while still allowing the seal to prevent rain from entering the upper portion thereof. A plurality of extended members extend from the lower portion of the sleeve for retaining the sleeve properly positioned during ground freezing and various other conditions that tend to apply an upward force upon the sleeve.