A bagger attachment for use with a stand-on lawn mower. The bagger includes, in some embodiments, an impeller, a duct, and one or more bags which are covered by a hood. The hood is attached to a pivot frame that allows movement of the hood between open and closed positions. The bagger attachment may also include a frame assembly that facilitates mounting and removal of the bagger attachment from the mower. The bagger attachment may either contain removable bags, or may include a discharge door for dumping the clippings.