Abstract: An adjustable bed frame includes a headboard, a pair of longitudinal side rails in spaced-apart, parallel relationship, and a telescoping slat assembly connecting the headboard and side rails together to define a rectangular bed frame that is adjustable between a first rectangular size and a second rectangular size smaller than the first rectangular size. The telescoping slat assembly includes a set of tubular members that telescopically receive a respective set of elongated members to form telescoping slats. The tubular members have one end secured to one of the side rails and extend away therefrom in parallel, spaced apart relationship. The elongated members have one end secured to the other one of the side rails and extend away therefrom in parallel, spaced-apart relationship. The side rails are slidably secured to the headboard to facilitate movement of the frame between the first and second rectangular sizes.