Based on the results obtained for the solar drying of thymus and mint, it was found that the drying times of thymus and mint depend on the mass of the drying product and temperature of the
drying air. Both thymus and mint are exhibit the constant and failing rate periods of solar drying of agricultural products. It was found that, Midilli and Kucuk model is convenient to describe the thin layer solar drying of mint. However, the Page and modified Page models were found to be the best among others for describing the drying curves of thymus. These models gave the highest values of correlation coefficient and lowest value of reduced chi-square. The abnormal drying behavior of thymus needs further study at different mass flow rates and various temperatures of the drying air. The cost of drying mint and thymus in the indirect-mode forced convection solar dryer was found to be 0.025 €/kg and 0.087 €/kg, respectively.