The goal of this study was to define a set of vehicle greenhouse geometries that are representative of the current vehicle fleet for use on a parametric rollover test buck. Greenhouse geometry data for 60 vehicles were taken from New Car Assessment Program (NCAP) test reports and compiled in a database for analysis. The database was then used to determine XYZ coordinates for landmark points that characterized the greenhouse geometries for those 60 vehicles. These landmark-based greenhouse representations were then analyzed and grouped into one of three groups using an Optimization technique. The mean shape was found for each group, and this was used as a representation of the group. These three representative shapes were found to have a maximum variation of 15 degrees in the windshield angle, 120 mm in roof rail height, 119 mm in greenhouse roofline width, and 258 mm in B- to C-pillar length.