The aim of the study was to examine the influence of time and temperature of storage and leakiness of packaging bags on changes of fat fraction and organoleptic properties of frozen French fries. The frozen French fries after I stage of frying obtained from the manufacturer were used in tests. French fries – originally packed closed and opened (thorn) were stored for 4 months in cooling chambers at -20 and -29°C were analyzed. The measurements conducted every month during four months of storage in frozen material included the dry matter and fat content, acid and Lea value of the fat extracted from products, fatty acid composition. In fried French fries texture, colour, acid and Lea value of the fat and organoleptic evaluation including colour , taste, smell and texture were analysed. On the basis of the tests it was stated that French fries before storage exhibited proper content of good quality fat (acid and Lea value) and good organoleptic quality. Some changes in fat fraction of 4 months stored French fries were stated – increase of Lea value and peroxides content and decrease of polyunsaturated fatty acids content. The changes were more intensive in samples stored in opened (thorn) packaging. The time of storage and leakiness of packaging influenced French fries texture – samples stored in opened packaging exhibited too hard texture. The 4 months French Fries storage at -20 and -29°C did not decrease the quality of the product, only if the package was closed.