A mattress cove rassembly (1), for use with a mattress(4) supported upon an adjustable foundation (8) having at least one movable frame portion, includes a cover in which the mattress is at least partially positionable. The cover (1) has a head portion (56) coinciding with ahead (64) of the mattress and afoot portion(60)coinciding with afoot (68)of the mattress. The mattress cover assembly also includes a pocket (92, 100) located at one of the head portion (56) and the foot portion (60) of the cover(1). A first movable frame portion of the adjustable foundation is at least partially receivable in the pocket for securing the one of the head portion(56)and the foot portion (60) of the cover to the first movable frame portion.