The investigation covered two kinds of the raw material (the leafy part and whole plants of dill 20 cm in height), varied processing before freezing (blanching of the raw material or without blanching), and two different storage temperatures (–20°C and –30°C) during 12-month storage, analyses of frozen products being conducted every 3 months. In comparison with whole dill plants the content of dry matter in leaves was higher by 36%, of total sugars by 45%, starch by 6%, dietary fibre by 35%, polyphenols by 58%, volatile oils by 32%, and total acids by 36%. The activity of peroxidase and catalase in leaves was higher by 59% and 71% respectively. In both usable parts of dill blanching caused significant changes in the level of all chemical components except for dietary fibre. Irrespective of the usable part, preliminary processing and storage temperatures, refrigerated storage caused slight changes in the level of dry matter, total sugars, starch, dietary fibre and total acids. Blanching before freezing and a lower temperature of refrigerated storage resulted in better retention of polyphenols and volatile oils in the two usable parts. At each stage of the investigation frozen leaves were characterized by higher sensory quality. Maintaining high sensory quality of frozen dill for three months did not require blanching and a storage temperature of –20°C was adequate. Storage at –30°C or at –20°C but with blanching before freezing was indispensable for maintaining very good quality for six months. Frozen dill stored for more than six months maintained good quality only when blanched raw material had been used; in addition to this, a lower storage temperature had a favourable effect on maintaining sensory quality, particularly in the case of 12-month storage.

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