BirdAnalyst
Species · South Dakota · BBS 2025 Release · 1966–2024

Brown Thrasher Population Trend in South Dakota

All statesGeneralists

Brown Thrasher in South Dakota has fallen sharply: down 55% on the route-weighted index since 1969.

-55%Since 1969
56Routes In State
57Years

Notable Brown Thrasher Trends in South Dakota

long arc declinecomputed index

Brown Thrasher has fallen sharply in South Dakota: down 55% on the route-weighted index since 1969.

Brown Thrasher Population Forecast in South Dakota

If the recent trend holds, Brown Thrasher in South Dakota is projected to stay roughly flat through 2029, near 1.4 (95% range 0.14–2.6). A 5-year backtest shows a typical error of ±20.7%, with 100% of held-out values landing inside the 95% band.

-0%Change by 2029
1.4Projected 2029 index
0.14–2.695% range
±20.7%Backtest error
19672029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20251.50.292.7
20261.50.252.7
20271.40.222.6
20281.40.182.6
20291.40.142.6

Brown Thrasher Survey Routes in South Dakota

Routes recording Brown Thrasher in South Dakota.
Rosebud1220111967
Badlands920231982
Chamberlain820111967
Ft Thompson620111967
Britton620231967
Conde619841968
Gettysburg620231970
Cedar Pass620231968
White Lake520111967
Laplant520111971
Gorman520091979
Reva520241979
Isabel520131990
White River520141994
Winner420241968
Lane419991967
Veblen420231967
Promise420141971
Maurine420241968
Lodgepole420241995
Marcus420141999
Lennox320241967
Geddes320211967
Volga320241967
Roswell320141967

Brown Thrasher Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.