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Zinc Oxide (ZnO) has attracted much attraction for its potential applications in ultraviolet region including sensors, solar energy, laser technology, optoelectronics and transparent conducting oxide. In this work, the influence of growth time and concentration of Hexamethylenetetramine (C6H12N4 / HMTA) on the formation of ZnO nanorods using Chemical Bath Deposition were investigated. ZnO nanorods (ZNRs) were synthesized on the FTO glass through a chemical bath deposition (CBD) using zinc nitrate tetrahydrate powder (Zn(NO3)2.4H2O) and HMTA with molar ratio 1:1, 1:2 and 1:4 at 90°C. The growth duration was varied at 120, 150 and 180 minutes at annealing temperature of 90oC. The synthesized ZnO was characterized using a scanning mission electron microscope (SEM), X-ray diffraction (XRD), and ultraviolet-visible spectroscopies (UV-Vis). Growth duration and concentration of HMTA were found to influence the morphology, orientation, and diameter of the ZNRs. X-ray diffractograms demonstrated strong and sharp peak at (002) plane as an indication of c-axis ZNRs. Secondary electron images showed that ZNRs were well aligned along the c-axis and the diameter of nanorods is increasing with the increased of growth time and concentration of HMTA. The optical properties of ZNRs showed that the absorbance increase at high growth time and concentration of HMTA.