Birds of North Carolina:
their Distribution and Abundance
Swainson's Thrush - Catharus ustulatus
TURDIDAE Members:
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General Comments The Swainson's Thrush is another thrush that nests across the boreal forest zone of Canada, south into the Rockies and part-way down the Appalachian chain. Interestingly, despite "global warming", the range in the Appalachians has slowly been moving southward, such that a few singing males (and hopefully females) are now present in several spruce-fir forests in North Carolina. However, despite the likelihood that it currently nests, no conclusive evidence has yet been found. Interestingly, the Hermit Thrush also occupies essentially all of the spruce-fir stands where the Swainson's occurs, and the Veery occurs with them or at least occurs just below them in elevation. How these similar thrushes partition the micro-habitats within the spruce-fir zone is an unanswered question. Across the rest of the state, this is an uncommon to at times fairly common migrant (slightly more numerous than Veery, and definitely more numerous than Gray-cheeked and Bicknell's). Like them, it occurs mainly in mature hardwood forests, with a moderately dense understory and shrub zone. There are a number of winter reports, but none are corroborated by photographs or specimen; few if any have been studied by experienced birders, and reports between 15 Nov and 15 Apr are likely not valid.
Breeding Status Breeder
NC BRC List Definitive
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Coastal Plain Transient. In spring, uncommon in the western portion, but rare in the central and eastern portions. In fall, generally uncommon throughout. Mainly early to mid-May and mid-Sep to mid-Oct. Peak counts:
Piedmont Transient. Uncommon to fairly common across the region, both in spring and fall; probably more numerous in fall, but as it does not sing in fall, it is easily overlooked. Mainly late Apr to late May, and mid-Sep to mid-Oct. Peak counts:
Mountains Summer resident, almost certainly breeding (both pre-1900 and after a lapse of over 100 years, post-2000) at a few sites; transient throughout. A few birds occur as of 2015 in the breeding season in the Black Mountains (Mount Mitchell and along the adjacent Blue Ridge Parkway), Roan Mountain area, and Grandfather Mountain. A nest was reported on Craggy Mountain (Buncombe) on 20 May 1896. Uncommon to fairly common in both spring and fall, but more numerous in fall; can be common to occasionally very common after cold fronts in fall, at higher elevations. Mainly early to late May, and mid-Sep to mid-Oct. Peak counts: in the breeding season, up to 6 singing males in the Black Mountains (Yancey) from 1 Jun - 17 Jul 2013.
Finding Tips Finding the species in migration is always "chancey", so you need to bird at parks or refuges in the first half of May, or from late Sep to mid-Oct. They are more vocal in spring, when males sing in migration. You might want to try stopping at overlooks on the Blue Ridge Parkway in Jun, in the vicinity of the road to Mount Mitchell SP. Birding along the Parkway in late Sep the day after a cold front can often produce a dozen or more birds.
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Attribution LeGrand[2017-12-18], LeGrand[2015-01-29], LeGrand[2014-04-05]
NC Map
Map depicts all counties with a report (transient or resident) for the species.
Click on county for list of all known species.
NC Breeding Season Map
Map depicts assumed breeding season abundance for the species.
NA Maps
(source NatureServe)

View NatureServe distribution maps for Catharus ustulatus