Habitat restoration is an ecological management tool used to address the erosion of biodiversity caused by human activities. In this study, we examined the effect of restoration work in temperate highland forests, carried out to restore habitats for capercaillie Tetrao urogallus, a bird species known to be highly sensitive to habitat loss, fragmentation and anthropogenic disturbance. We used automatic audio recorders to investigate the daily and seasonal dynamics of acoustic biodiversity in recently restored temperate forests and compared them to unrestored control sites. From the recorded soundscapes, we compared the acoustic entropy difference (dH) and the acoustic dissimilarity (D) in three different habitat types: pure beech forests, mountain pine forests with dense rhododendron understories, and a mature mixed fir-beech forest. The dH index revealed an increase of the soundscape entropy or complexity in the restored habitats regardless of forest type, which may reflect a diversification of species present in the restored forest habitats. The D index revealed significant acoustic dissimilarity between control and restored montane pine forests, for which the new microhabitats may support greater spatial heterogeneity of biodiversity. The dH index also revealed an increase in bioacoustic entropy throughout the recording season at most sites (during spring/summer), with lower daily variability in bioacoustic entropy at restored sites compared to control sites, particularly in the afternoon. These results suggest that long-term bioacoustics monitoring can provide data that support forest conservation efforts conducted over large spatial and temporal scales.