Aluminum possesses numerous advantages as a construction material such as a high strength-to-weight ratio, excellent durability, corrosion resistance, recyclability, and formability. Nevertheless, due to the limited knowledge of their buckling behavior and efficient design recommendations, aluminum alloys are yet to be accepted widely in structural applications. To enable a more efficient design for aluminum structural members, this study aims at analyzing the buckling behavior of aluminum extrusions through experimental studies. With the specific objective to investigate the local buckling instability of aluminum extrusions, four series of stub column tests with axial compression and ten short beam-column tests with eccentric compression were performed on Circular Hollow Sections (CHS) with 6061-T6 aluminum alloy. The initial geometrical imperfections of the specimens were measured by using professional 3D scanners and the material properties were obtained through tensile coupon tests.