An adjustable lumber stand system may include a pair of adjustable leg assemblies. Each leg assembly may comprise a first external tubular section into which a second internal section may longitudinally slidably adjust. A pair of base anchors configured to anchor the pair of adjustable leg assemblies may be coupled to lower ends of the first external tubular sections. A pair of adjustable support bracket assemblies may comprise a brace and a support arm configured to support lumber. The first end portions of the support arms and the braces may be coupled to one another and second end portions of the support arms and the braces may be coupled to different locations on the first external tubular sections. A pair of top anchors configured to anchor the pair of adjustable leg assemblies to a structure may be coupled to upper ends of the second internal section.