Abstract: A rotary mower is provided with a side guard preferably along the left side of the housing and extending fore-and-aft to the outboard sides of the left-hand front and rear wheels at about axle height for the purpose of protecting the mower against obstacles at that side. The guard is extended in J fashion at its front and rear ends to extend around the front of the front wheel and in back of the rear wheel and each J portion has a short leg for affixation to existing parts of the mower, such as the housing, front and rear axles and the like. The guard is adjustable fore-and-aft to compensate for differences in spacing of the front and rear axles.