 Breeding evidence |
 Relative abundance |
 Probability of observation |
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Click on plot to view table of mean abundance
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Number of squares
Long-term BBS trends
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2.27 (0.256 - 4.11)|
Mean abundance (number of birds detected per 5 min. point count) and percentage of squares occupied by region Bird Conservation Regions [abund. plot]
[%squares plot]
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Atlas Results
Chestnut-sided Warblers were observed primarily in a relatively narrow strip of the province, encompassing the Boreal Transition, Mid-Boreal Lowland, and the southern portions of the Mid-Boreal and Churchill River Uplands. They were also found at Moose Mountain Provincial Park and a few scattered locations in the Aspen Parkland, with one record in the southern Athabasca Plain. In total, Chestnut-sided Warblers were reported in 177 atlas squares, and heard at 405 point count locations. Confirmed breeding evidence was in short supply with confirmations in only eight squares and no nests found.
Excerpts Adapted from the Birds of Saskatchewan:
Primarily a bird of the northeastern US, the Maritimes, and central Canada, the Chestnut-sided Warbler extends west to Saskatchewan, where it is most common in the understory of aspen forests. Recently, its range has expanded into the boreal forest of eastern Alberta, the extreme limit of its range in North America (Semenchuk 2007). It winters in Central America, its numbers peaking in Costa Rica.
Thick growths of hazelnut are invariably found in the areas preferred by this warbler (Callin 1980). At Duck Mountain it prefers mature aspen with a 1.2-2.4 m understory of hazelnut or mountain maple (Bob Kreba). Its nesting habitat also includes regenerating forest on clearcuts, abandoned agricultural land, and recent burns.
The Chestnut-sided Warbler is a common summer resident of the deciduous second-growth in the southern boreal region and rare in the northern boreal region. In the grasslands it is only an uncommon transient, largely avoiding the open plains. It is locally common in the parkland region, especially in the Touchwood Hills (Smith 1996).
Original text by Gordon Taylor. Text adapted by Daniel J. Sawatzky
Read more about the Chestnut-sided Warbler in the Birds of Saskatchewan here.
Recommended citation: Latremouille, L. M. 2025. Chestnut-sided Warbler in Latremouille, L. M., S. L. Van Wilgenburg, C. B. Jardine, D. Lepage, A. R. Couturier, D. Evans, D. Iles, and K. L. Drake (eds.). 2025. The Atlas of the Breeding Birds of Saskatchewan, 2017-2021. Birds Canada. Saskatoon, Saskatchewan https://sk.birdatlas.ca/accounts/speciesaccount.jsp?sp=CSWA&lang=en [09 Nov 2025]
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