BirdAnalyst
Species · BCR 19 · BBS 2026 Release · 1966–2025

Eastern Bluebird In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieForest birds

Eastern Bluebird in Central Mixed Grass Prairie has risen sharply: up 73% on the route-weighted index since 1969.

+73%Since 1969TrendPercent 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 →
119Routes 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 →
58YearsYears 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Eastern Bluebird has risen sharply in Central Mixed Grass Prairie: up 73% on the route-weighted index since 1969.

Eastern Bluebird In Central Mixed Grass Prairie Population Forecast

If the recent trend holds, Eastern Bluebird in Central Mixed Grass Prairie is projected to rise about 64% by 2030 — from 2.4 in 2025 to a central estimate of 4.0 (95% range 2.0–5.9). A 5-year backtest shows a typical error of ±239.1%, with 0% of held-out values landing inside the 95% band.

+64%Change by 2030TrendPercent 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 →
4.0Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
2.0–5.995% 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 →
±239.1%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, Eastern Bluebird in Central Mixed Grass Prairie is projected to rise about 64% by 2030 — from 2.4 in 2025 to a central estimate of 4.0 (95% range 2.0–5.9). A 5-year backtest shows a typical error of ±239.1%, with 0% of held-out values landing inside the 95% band.19672030
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 →
20263.71.85.7
20273.81.85.8
20283.91.95.8
20293.91.95.9
20304.02.05.9

Routes In Central Mixed Grass Prairie

Routes recording Eastern Bluebird in Central Mixed Grass 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 →
VerdenOKLAHOMA412017
DaltonKANSAS212025
KanopolisKANSAS182025
Ft Sill WestOKLAHOMA171994
ElginOKLAHOMA152016
Wichita MtnsOKLAHOMA151994
BradyNEBRASKA132025
GrimesOKLAHOMA122025
Wichita Mts WestOKLAHOMA112019
LibertyNEBRASKA102003
Liberty 2NEBRASKA102007
LookoutOKLAHOMA102025
CoopertonOKLAHOMA92025
CashionOKLAHOMA92024
WellingtonKANSAS82025
RandlettOKLAHOMA82025
Shields 2TEXAS82025
CoatsKANSAS72025
JewellKANSAS72005
WilliamsTEXAS72021
GrayKANSAS62019
Ft Sill EastOKLAHOMA61994
ColdwaterKANSAS52019
DamarKANSAS52012
Red CloudNEBRASKA52024

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.