Spatial organisation, and the rate and causes of mortality of released hares were investigated using a radio-telemetry technique during one study year in the vicinity of Maciejowice, Poland. Territorial ranges of released hares were between 0.14 km² and 2.86 km². The average home ranges of males were significantly greater than that of females: 1.3 km² and 0.5 km², respectively. Released hares travelled, on average, a distance of 2.6 km (range = 1.4–4.9 km per year). The annual mortality of the studied was ca. 72% and was highest in the first month after release, i.e. in December. The average lifespan of killed hares was 31 days for females and about 80 days for males. The major cause of hare mortality was predation.