A selectively deployable extender is provided on the rear of a platform assembly of a stand-on lawnmower so as to permit an operator to position his or her feet further from the rear wheels than would otherwise be possible in order to increase operator comfort and/or to improve traction and/or maneuverability. By making the platform selectively deployable as opposed to simply providing a longer platform, the length of the machine can be reduced for storage and transport, and the risk of making damaging contact with an obstruction or with the ground while traveling up a hill is reduced. The extender may, for instance, be a plate or similar device pivotally attached to a rear end of a main platform and the main platform can be resiliently mounted to or at least partially isolated from a frame of the stand-on lawnmower.
