Monitoring of breeding bird populations in the boreal forest is an important but difficult task, and despite the wide range of bird surveys conducted in Québec (Canada), population trends for this region remain imprecise. The present study provides a new set of trend estimates based on a 20-year dataset from the Forêt Montmorency, located in the boreal forest zone (balsam fir—white birch domain), 70 km north of Québec City. Regardless of preferred forest successional stage, the abundance of most species recorded in this area has remained stable or increased since 1995. These trends appear to be linked to recent local changes in habitats, such as forest management. The population trends for the Forêt Montmorency concord weakly, but generally positively, with those obtained over a similar time period by the Breeding Bird Survey, and by the Tadoussac and McGill bird observatories. The population trends from this monitoring program suggest either a strong regional variation in the status of the species considered, or a possible misunderstanding of the actual status of bird populations due to insufficient monitoring throughout the boreal forest.