At nighttime the European Dipper is known to frequent nest boxes or nests from the previous year. Birds use such structures individually as space inside is limited. The European Dipper, will, though, occasionally choose spacious tunnels or sections of buildings as roosting sites which they share with other individuals. Temperature seems to be the decisive factor determing the quality of a roost site. Two sites, a small one visited by individuals or pairs and a larger second one which attracted up to 11 individuals were selected for a study carried out consecutively from 1992, 1997 to 2016 respectively. Both roosting sites were located in tunnel-shaped shafts close to streams and rivers. In both shafts temperatures were higher than in comparable open locations. As winter progressed the number of birds roosting at the sites decreased. This chronological phenology can be ascribed to the species’ territorial behavior and early initiation of breeding. Apparently, once birds have chosen a particular site to roost in, they have made a choice that lasts a lifetime.