In curved I-girder systems, stability is mainly provided by interconnecting cross-frames or diaphragms. These members act as primary load carrying component thus proper design and analysis must be made. This study proposes improvement on the existing cross-frame spacing limit for horizontally curved girder systems utilizing buckling capacities. Eigenvalue analysis was conducted using the finite element program, ABAQUS. Maximum cross-frames spacing (Smax) was computed with varying degree of curvature, flange width-to-depth ratio ( ) and span length-to-depth ratio (L/d). Models were then generated and their buckling modes and critical buckling capacity ratios were obtained. Lastly, a suggestion was developed based on the results of the finite element analysis to provide a better guide on the design of cross-frame spacing limit. The suggested limit was then compared to the existing cross-frame limit to verify the improvement on the cross-frame spacing.