FRP pultruded profiles having I-shaped sections are used as load bearing compression and flexural members in truss and frame structures. For design purposes closed form expressions are desired for predicting both global and local failure loads due to buckling or material rupture. A set of closed-form equations has been assembled from the technical literature for the prediction of the critical local and global failure modes of pultruded columns needed for design. A database of tests on pultruded columns conducted over the last 15 years and reported in the technical literature was used to verify the accuracy of the proposed theoretical equations. Only those test data for which the measured orthotropic material properties of the profiles tested were reported were considered. This paper presents comparisons between the theoretical equations and test data for wide-flange pultruded columns for two failure modes, local-flange buckling and global-flexural buckling. Insufficient test data exist in the literature on other profiles (such as narrow flange I beams or box sections) or for failure modes other than those noted. However, since most pultruded columns used are of the wide-flange profile type and have been shown to fail either in local or global buckling modes, the results presented are of practical importance. The paper also addresses the phenomenon of the interaction of local and global buckling modes for intermediate length columns. Ultimately, the results of this investigation will be used to develop resistance factors for a load and resistance factor design (LRFD) basis for pultruded columns.