The subject application provides a windrow pickup header including an improved windrow hold down device. The windrow hold down device includes a channel member extending across a width of a windrow pickup header chassis, a unitary retention plate carried by the channel member, a first plurality of tines secured to the channel member by the unitary retention plate, and a second plurality of tines pivotably secured to the channel member and selectively engageable with the unitary retention plate to place the second plurality of tines in a non-pivoting stowed position. The unitary retention plate combines multiple tine retention functions into a single part thereby reducing materials costs as well as the labor required to assemble the windrow hold down device.