Blueberries (Vaccinium corymbosum L., cv. Bluecrop) were obtained from a local farm (Czerwinskie, Baranowo, Poland). Blueberries were divided into two groups and packed in sealed plastic containers several hours after harvest. The first group was refrigerated (2 ± 2 °C) at 90% relative humidity for up to two weeks. In the applied storage conditions, the fruits remained unfrozen for a specified period of time ( Whiteman, 1957, 32 pp.). The second group was frozen (−20 ± 2 °C) and stored under freezing conditions for up to two weeks. Frozen blueberries were thawed for 24 h in a refrigerator before the experiment. Both, refrigerated and frozen blueberries were warmed at room temperature for 2 h to reach equilibrium temperature before drying tests. The minimum freezing and refrigeration time under specified conditions was 48 h. The first group of fruits was referred to raw blueberries and the second group as frozen/thawed blueberries.