Abstract: A new and improved walkable secure patio door threshold with a lower extrusion having a lower surface and a vertical extension. The lower surface has a plurality of apertures vertically therethrough. The vertical extension is integral with the lower surface of the lower extrusion. An upper extrusion has a plurality of guide grooves and a plurality of break grooves. Each of the guide grooves function to receive a sliding door. Each of the break grooves function to allow adjustment to accommodate a various number of sliding doors. A convoluted end portion is formed adjacent the sliding groove. A plurality of countersunk apertures are formed within the plurality of guide grooves. The countersunk apertures are aligned with the plurality of apertures formed in the lower surface of the lower extrusion for securement thereon.