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

Blue Grosbeak Population Trend in Maryland

All statesGeneralists

Blue Grosbeak in Maryland has surged: up 209% on the route-weighted index since 1968.

+209%Since 1968
69Routes In State
58Years

Notable Blue Grosbeak Trends in Maryland

long arc increasecomputed index

Blue Grosbeak has surged in Maryland: up 209% on the route-weighted index since 1968.

Blue Grosbeak Population Forecast in Maryland

If the recent trend holds, Blue Grosbeak in Maryland is projected to rise about 22% by 2029 — from 7.3 in 2024 to a central estimate of 8.8 (95% range 6.4–11). A 5-year backtest shows a typical error of ±9.3%, with 100% of held-out values landing inside the 95% band.

+22%Change by 2029
8.8Projected 2029 index
6.4–1195% range
±9.3%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
20258.56.111
20268.66.211
20278.76.311
20288.86.411
20298.86.411

Blue Grosbeak Survey Routes in Maryland

Routes recording Blue Grosbeak in Maryland.
Cokesbury4520241966
Harmony4320171966
Easton3020211966
Mardela2620191967
St. George'S Island2520172015
Tall Timbers2420141966
Walnut2320241999
La Plata2120091966
Newark2120241966
Forest Grove2020232011
Berlin2020241980
Millington1920241966
Honga1820241966
Vienna1820241966
Indiantown1820141977
Pt Republic1619891966
Sinepuxent1619781966
Melitota1320241966
Matthews1320241966
Davidsnville1320241982
Madison1220241967
Pr Frederick1120241991
Golden Hill1020241966
Emmitsburg920241976
Cheltenham920041966

Blue Grosbeak Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianaminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvirginiawest-virginiawyoming

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