BirdAnalyst
Species · Delaware · BBS 2025 Release · 1966–2024

Eastern Bluebird Population Trend in Delaware

All statesForest birds

Eastern Bluebird in Delaware has surged: up 24× on the route-weighted index since 1969.

24×Since 1969
15Routes In State
53Years

Notable Eastern Bluebird Trends in Delaware

long arc increasecomputed index

Eastern Bluebird has surged in Delaware: up 24× on the route-weighted index since 1969.

Eastern Bluebird Population Forecast in Delaware

If the recent trend holds, Eastern Bluebird in Delaware is projected to fall about 23% by 2029 — from 10 in 2024 to a central estimate of 7.8 (95% range 5.1–11). A 5-year backtest shows a typical error of ±31.8%, with 40% of held-out values landing inside the 95% band.

-23%Change by 2029
7.8Projected 2029 index
5.1–1195% range
±31.8%Backtest error
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 index95% low95% high
20257.34.69.9
20267.44.710
20277.54.910
20287.75.010
20297.85.111

Eastern Bluebird Survey Routes in Delaware

Routes recording Eastern Bluebird in Delaware.
Frederica1520141966
Georgetown1520221992
Millsboro1420242017
Harrington1020241973
Holleyville 21020242006
Pepperbox 21020242017
Mt Pleasant920191969
Holleyville920041966
Frankford820121968
Blackbird720241994
Milton 2720172017
Wilmington420141991
Pepperbox320161998
Lowes Xrds119851966
Milton120161994

Eastern Bluebird Population Trend in Other States

alabamaarizonaarkansascoloradoconnecticutfloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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