BirdAnalyst
Species · BCR 30 · BBS 2025 Release · 1966–2024

Boat-tailed Grackle In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastGeneralists

Boat-tailed Grackle in New England / Mid-Atlantic Coast has held roughly steady: down 5% on the route-weighted index since 1968.

-5%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 →
23Routes 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 →

No notable trend signals for Boat-tailed Grackle in New England / Mid-Atlantic Coast. See the full index history below.

Boat-tailed Grackle In New England / Mid-Atlantic Coast Population Forecast

If the recent trend holds, Boat-tailed Grackle in New England / Mid-Atlantic Coast is projected to rise about 72% by 2029 — from 0.70 in 2024 to a central estimate of 1.2 (95% range 0.00–4.4). A 5-year backtest shows a typical error of ±257.6%, with 100% of held-out values landing inside the 95% band.

+72%Change 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 →
1.2Projected 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 →
0.00–4.495% 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 →
±257.6%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, Boat-tailed Grackle in New England / Mid-Atlantic Coast is projected to rise about 72% by 2029 — from 0.70 in 2024 to a central estimate of 1.2 (95% range 0.00–4.4). A 5-year backtest shows a typical error of ±257.6%, 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 →
20251.20.004.4
20261.20.004.4
20271.20.004.4
20281.20.004.4
20291.20.004.4

Routes In New England / Mid-Atlantic Coast

Routes recording Boat-tailed Grackle in New England / Mid-Atlantic Coast.
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 →
QuinbyVIRGINIA652012
Bethany BchDELAWARE641990
Golden HillMARYLAND292008
Ocean CityNEW-JERSEY232024
HarringtonDELAWARE202024
Holleyville 2DELAWARE102009
Lowes XrdsDELAWARE91986
Six PointsNEW-JERSEY92024
BlackbirdDELAWARE82015
MiltonDELAWARE41971
GeorgetownDELAWARE42021
DoverDELAWARE21979
HongaMARYLAND22018
WesthamptonNEW-YORK22000
White StoneVIRGINIA22017
PepperboxDELAWARE12004
MadisonMARYLAND12019
SinepuxentMARYLAND11975
Toms RiverNEW-JERSEY11998
Cape May ChNEW-JERSEY12004
SharpsVIRGINIA12001
Chincoteag WVIRGINIA12024
Cape CharlesVIRGINIA12011

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