A boom deck and removable side deck mowing tractor device facilitates efficient conversion between use of the boom deck and the side deck. The device includes a boom arm coupled to and extendable from a tractor. A boom deck is coupled to the boom arm and a first mowing blade is coupled to the boom deck wherein the boom arm, the boom deck, and the first mowing blade define a boom mower. A side deck is removably coupled to a lateral side of the tractor. A second mowing blade is coupled to the side deck wherein the side deck and the second mowing blade define a side mower. A control mechanism is coupled to the tractor and selectively couplable to each of the boom mower and the side mower wherein the control mechanism controls a selectable one of the side mower and the boom mower.