An agricultural work vehicle is operable to be advanced along the ground to sever a swath of standing forage plants and to lay the severed forage material into a windrow. The agricultural work vehicle includes a powered chassis, a harvesting header, and a quick-attachment header adapter. The header adapter is shiftably supported by the powered chassis and is configured to selectively support the harvesting header. The header adapter includes an adapter frame, having end supports and a center support, and a selectively actuatable latch assembly supported on the adapter frame. The latch assembly is associated with at least one of the supports to releasably secure the harvesting header to the adapter frame when the latch assembly is engaged and permit disconnection from the adapter frame when the latch assembly is disengaged.
