A hay bale dryer features a support frame inside of which there is delimited at least one bale space and at least one manifold carrying a set of aeration spears movable between a deployed position penetrating the bale space and a retracted position withdrawn therefrom. The manifold is moved between the positions by way of an actuator driven linkage, and the aeration spears comprise hollow elongated bodies of tapered thickness toward their distal ends for more effective penetration of the hay bales. A manufacturing method uses a hydraulic press to produce the hollow elongated bodies from lengths of originally cylindrically pipe. Horizontal feeding tables and upright feeding racks feature displaceable bale movers for moving queued hay bales along one or more queuing lanes into one or more bale dryers.