In order to determine the optimum maturity stage of sweet cherry (Prunus avium L.) fruit of the Sweet collection, the pomological properties of cultivars 'Sweet Aryana', 'Sweet Lorenz', 'Sweet Gabriel', 'Sweet Valina' and 'Sweet Saretta' were studied. Fruit were sampled at the Fruit growing center Bilje in 2018. For each observed cultivar, 25 fruit were randomly sampled and categorized into maturity classes on the basis of the CTIFL color scale, where CTIFL with a larger number indicating darker red colored fruit. Fruit weight, width, height and thickness, firmness, skin and flesh color (parameters L*, a*, b*, C and h°), pH of fruit juice, soluble solids content and content of titratable acid were measured. The fruit stone was weightened to define the edible part of the fruit. The ratio soluble solids content/titratable acid was calculated. Firmness of the skin and flesh, the ratio sweet/sour, the juiciness of the flesh, the aroma and the taste were estimated by fruit tasting. Color of the flesh and juice was assessed visually. Fruit weight, fruit dimensions and soluble solids content were generally higher, firmness, skin and flesh color parameters were lower in CTIFL with higher number, but titratable acids were generally similar. We found that cultivar 'Sweet Aryana' should be harvested in CTIFL 4, 'Sweet Lorenz' and 'Sweet Gabriel' in CTIFL 6, 'Sweet Valina' and 'Sweet Saretta' in CTIFL 5. Cultivars in those classes had higher firmness, an adequate fruit weight with a good content of soluble solids and titratable acids.
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