Due to its rarity and perhaps because it breeds primarily in the centre of large woods, there is limited information on the Canadian population of Hooded Warbler. The Atlas of the Breeding Birds of Ontario indicates a large increase in the probability of observation between the first (1981-1985) and second (2001-2005) atlases, though it is possible that increased survey effort during the second atlas may have contributed to this trend (COSEWIC 2012c). Despite this possibility, the increase is corroborated by directed surveys of Hooded Warblers between 1997 and 2007, which indicate an increase in numbers of more than 300% (COSEWIC 2012c). However, both these sources are now somewhat out of date and may not reflect the current situation. While there are insufficient data to estimate a trend for Canada, Breeding Bird Survey results from across North America indicate an increasing population at the continental level; increases vary regionally but large increases are seen in the northeastern part of the species' range as well as elsewhere. Overall, the Hooded Warbler population is considered to have shown a large increase in Canada and is at an acceptable level relative to its national population goal. However, due to the lack of early and recent data on the Canadian population, this assessment has low reliability.
Additional information on: Atlas of the Breeding Birds of Ontario
Additional information on: Breeding Bird Survey (BBS) - Canadian analysis