This research was conducted to investigate the effect of two growth regulators on freezing resistance of apricot blossoms in cultivar Tabarzeh. The experiment was carried out as a factorial experiment with three temperature treatments (0, -1.5, and -3°C) and two kinds of growth regulators [prohexadione calcium (40 and 60 mg/L) and salicylic acid (0.5 and 1 mM)] with a control, based on a completely randomized design with three replications. Some traits, such as, intact pistil, pollen germination, electrolyte leakage percentage, and also, the concentration of free proline and antioxidant enzymes activities (catalase, peroxidase, superoxide dismutase) were evaluated. Regarding the damaged pistils, the results showed a significant difference between temperatures and growth regulators in studied cultivar. The percentage of intact pistils at the temperature of -3°C has decreased threefold compared to 0 °C. Pollen germination percentage was decreased by low temperatures and increased by growth regulators. The applied treatments had no effect on the rate of electrolyte leakage and proline concentration. In general the positive effects of salicylic acid and prohexadione calcium applications in freezing resistance of apricot blossoms have been shown by the results.