BirdAnalyst
Species · BCR 22 · BBS 2025 Release · 1966–2024

Blue-winged Warbler In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieForest birds

Blue-winged Warbler in Eastern Tallgrass Prairie has edged down: down 24% on the route-weighted index since 1968.

-24%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
46Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Blue-winged Warbler in Eastern Tallgrass Prairie. See the full index history below.

Blue-winged Warbler In Eastern Tallgrass Prairie Population Forecast

If the recent trend holds, Blue-winged Warbler in Eastern Tallgrass Prairie is projected to stay roughly flat through 2029, near 0.02 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±31.6%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.02Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0595% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±31.6%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Blue-winged Warbler in Eastern Tallgrass Prairie is projected to stay roughly flat through 2029, near 0.02 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±31.6%, with 100% of held-out values landing inside the 95% band.19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.020.000.05
20260.020.000.05
20270.020.000.05
20280.020.000.05
20290.020.000.05

Routes In Eastern Tallgrass Prairie

Routes recording Blue-winged Warbler in Eastern Tallgrass Prairie.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
SticklervillMISSOURI41972
New LenoxILLINOIS32007
ConcordILLINOIS21997
FrontenacMINNESOTA22019
HuntsvilleMISSOURI22021
TrentonMISSOURI21972
MillwoodMISSOURI22014
MoselleMISSOURI22024
MarionOHIO21972
PutnamILLINOIS11979
SheffieldILLINOIS11996
NewarkILLINOIS11983
BartonvilleILLINOIS12022
DaileyILLINOIS11985
BradburyILLINOIS12018
ColumbiaILLINOIS11972
FloraILLINOIS11995
YaleILLINOIS12002
Grape CreekILLINOIS12012
MarshallILLINOIS12018
SwayzeeINDIANA12001
BrookvilleINDIANA12023
Mt HamillIOWA12013
Red RockIOWA11969
FilleyMISSOURI12007

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