Wing plow assembly

A wing plow assembly includes a base member for mounting to a plowing vehicle (or to structures connected to a plowing vehicle, such as on a plow frame for a front moldboard). Upper and lower height adjustment arms each have a base end pivotally anchored to the base member, and an opposing plow end pivotally linked to a plow positioning leg. The base member, height adjustment arms, and plow positioning leg form a parallelogram linkage wherein the plow positioning leg may vertically swing on the height adjustment arms about the base member. A wing plow having a length extending between a inner end and a outer end has its inner end affixed to the plow positioning leg so that the wing plow may also vertically swing about the base member, thereby allowing the wing plow to be raised and lowered with respect to the base member (and thus with respect to the plowing vehicle). Additionally, the wing plow inner end is preferably affixed to the plow positioning leg so that it may swing horizontally thereon, thereby allowing the wing plow outer end to be folded toward or away from the plowing vehicle. The wing plow inner end is affixed to the plow positioning leg (or associated structure), and a wing fold linear actuator then extends from the outer end of the wing plow to affix to the plow positioning leg (or associated structure). The wing fold linear actuator is extendible and contractible to horizontally swing the wing plow about the plow positioning leg, and thus fold the wing plow with respect to the plowing vehicle.