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To optimally design post‐harvest handling and processing equipment for unripe green grape berries, it is necessary to determine the physical and mechanical properties of the product. In the current study, dimensional (by image processing), gravimetrical, frictional, and aerodynamic (by image processing) properties of unripe green grape berries affected by storage time (31 days in refrigerator) were investigated. Besides, rupture force, rupture energy, elasticity modulus, toughness, hardness, maximum compressive contact stress, Poisson's ratio (by image processing), and shear modulus in horizontal and vertical loading under different moisture content and loading rate levels were measured. Moreover, to model loading and stress‐relaxation behavior of bulk berries, berries were poured into cylinder and compressed. Effects of cylinder diameter, loading rate, the height of layers, and number of layers on loading …