BirdAnalyst
Species · New Jersey · BBS 2026 Release · 1966–2025

Blue-headed Vireo Population Trend in New Jersey

All statesForest birds

Blue-headed Vireo in New Jersey has increased: up 37% on the route-weighted index since 1992.

+37%Since 1992TrendPercent 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 →
7Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
21YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Blue-headed Vireo Trends in New JerseyNotable 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-headed Vireo in New Jersey. See the full index history below.

Blue-headed Vireo Population Forecast in New Jersey

If the recent trend holds, Blue-headed Vireo in New Jersey is projected to rise about 105% by 2030 — from 0.06 in 2025 to a central estimate of 0.12 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±67.7%, with 100% of held-out values landing inside the 95% band.

+105%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 →
0.12Projected 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 →
0.00–0.2395% 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 →
±67.7%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-headed Vireo in New Jersey is projected to rise about 105% by 2030 — from 0.06 in 2025 to a central estimate of 0.12 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±67.7%, with 100% of held-out values landing inside the 95% band.19862030
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 →
20260.110.000.23
20270.110.000.23
20280.110.000.23
20290.110.000.23
20300.120.000.23

Blue-headed Vireo Survey Routes in New Jersey

Routes recording Blue-headed Vireo in New Jersey.
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 →
Hope319861986
Sandbrook120042004
Midvale119861986
Kemah Lake120041995
Bloomsbury120251997
High Point120241988
Ramseysburg120242010

Blue-headed Vireo Population Trend in Other States

alabamaconnecticutgeorgiakentuckymainemarylandmassachusettsmichiganminnesotanew-hampshirenew-yorknorth-carolinanorth-dakotaohiopennsylvaniarhode-islandsouth-carolinatennesseevermontvirginiawest-virginiawisconsin

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