An apparatus for mounting grass collection bags to a riding lawn mower includes a mounting assembly fixed to a riding lawn mower frame and a lid assembly for carrying removable grass clippings collection bags. The mounting assembly includes slotted brackets that are adapted to receive transverse base pins that are fixed to the lid assembly. An operator may hang the lid assembly by its transverse base pins on the mounting assembly slotted brackets in a hanging position and then rotate the lid assembly up into a raised, operating position. As the lid assembly is rotated to the raised, operating position, a releasable latch mechanism connected to the mounting assembly receives and captures the lid assembly latch pins. With this grass clippings collection unit, a single operator can install or remove the lid assembly, making it possible to rapidly reconfigure the mower for collecting clippings or for not collecting clippings.
