A bed frame which can be assembled without the use of additional tools and may be collapsed for shipping. The bed frame comprises a pair of side rails, three cross rail assemblies and mounting brackets. Each of the cross rail assemblies is adjustable in length and comprises multiple movable members. Each cross rail member has a projection which fits inside a cavity of a leg assembly secured to one of the side rails. To disassemble the bed frame, the cross rail assemblies may be removed from the side rails without any tools.