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ZnO nanostructures have been attracting much interest of researchers due to their unique properties and wide potential for various applications. In this study, the effect of seeding temperature and growing time on the characteristics of ZnO nanorods were investigated. The seed solutions were first prepared at temperature of 0, 30, and 60℃ for 1 hour using zinc nitrate tetrahydrate and hexamethylenetetramine as precursors. The ZnO seed layers were then deposited onto ITO glass substrates by spin coating technique prior to the chemical bath deposition (CBD) growth at temperature of 90℃ for different times (3, 4, and 5 hours). The synthesized ZnO nanorods were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–Vis spectrophotometry. The results showed that with the increase in seeding temperature from 0℃ to 60℃, the crystallite size decreased from 71.32 to 38.95 nm, while the band gap energy increased from 3.27 to 3.55 eV, respectively. While with increased of growing time during CBD, the crystallite size was adversely increased from 65.37 to 88.09 nm, and consequently the band gap energy was found to decrease from 3,55 to 3,52 eV.