The aim of this study was to determine changes in some of the technological features of potato tubers of different earliness groups during long-term storage at 5 and 8°C. Material for the study was tubers of 15 varieties of potato from different groups of earliness. The study was conducted in 2011-2013 storage seasons. The material was grown on the field of IHAR-NRI Jadwisin. Tubers were harvested at full physiological maturity. After harvest the potatoes were placed in the experimental storage facility. Analyses were performed in three terms after harvesting and after 3 and 7 months of storage at 5 and 8°C, relative humidity 90-95%. The following parameters were determined for the potato tubers: content of dry matter and starch, enzymatic browning and darkening of potato tubers after cooking. On the basis of the study it was showed that the effect of temperature and storage time of 15 varieties of potatoes on changes in dry matter content in tubers was not significant. In the experiment significant differences (5%) were observed in 2 varieties of potato tubers in the content of starch in two seasons storage. All of the investigated cultivars were characterised by very low and low after-cooking darkening, both after harvest and storage. The influence of storage temperature and storage time was not significant.