Although the barred owl (Strix varia) is widely distributed across North America, its ecology is relatively poorly documented. The present study estimated the abundance of territorial pairs on Mont Saint-Bruno (Québec, Canada) over a 6-year period (2016-2021). The principal technique used was nest-searching. The number of pairs fluctuated somewhat, reaching a maximum of 24 in 2020 and 2021. This corresponds to a population density of 2.2 territorial pairs/km2 for the whole of the study area and 3.0/km2 for the central portion. These values are the highest reported for the species. The mean distance between neighbouring nests was 622 m in 2020, and 640 m in 2021. The minimum inter-nest distance was 332 m. These high densities can be explained by several factors, including the advanced age of the forest stands and the sparse undergrowth resulting from browsing by white-tailed deer. The presence of non-territorial individuals (floaters) suggests a slight underestimation of abundance and therefore of density, and a high population stability.