Abstract: A portable pitless livestock barrier whereby vehicles or humans may easily gain access to a livestock enclosure but provides a deterrent to the unwanted passage of the livestock from such enclosure. The barrier is provided by having a horizontal main frame to be placed on the ground with a vertical frame supported and attached to each side of the main frame. Within the boundaries of the main frame are two platform grates that are connected to the main frame at the exit and entrance to the barrier but can be adjustably raised in the central area of the barrier by a spring biased lever lifting mechanism attached to each vertical frame which allows the platform grates to be forced to the ground when a vehicle passes over but when the vehicle has passed the grates regain their inclined position giving a perception of depth or poor footing to the livestock thereby providing a deterrent to their passage.