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

Tricolored Heron In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastWetland birds

Tricolored Heron in New England / Mid-Atlantic Coast has declined: down 39% on the route-weighted index since 1981.

-39%Since 1981TrendPercent 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 →
12Routes 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 →
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 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 Tricolored Heron in New England / Mid-Atlantic Coast. See the full index history below.

Tricolored Heron In New England / Mid-Atlantic Coast Population Forecast

If the recent trend holds, Tricolored Heron in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.03). A 5-year backtest shows a typical error of ±60.2%, with 80% of held-out values landing inside the 95% band.

n/aChange 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 →
0.01Projected 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 →
0.00–0.0395% 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 →
±60.2%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, Tricolored Heron in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.03). A 5-year backtest shows a typical error of ±60.2%, with 80% of held-out values landing inside the 95% band.19682029
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 →
20250.010.000.03
20260.010.000.03
20270.010.000.03
20280.010.000.03
20290.010.000.03

Routes In New England / Mid-Atlantic Coast

Routes recording Tricolored Heron 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 →
Pepperbox 2DELAWARE22024
VillasNEW-JERSEY21981
QuinbyVIRGINIA21968
HarringtonDELAWARE12007
Lowes XrdsDELAWARE11968
MadisonMARYLAND12003
NewarkMARYLAND11979
Six PointsNEW-JERSEY12014
Ocean CityNEW-JERSEY12024
Cape May ChNEW-JERSEY12011
Chincoteag WVIRGINIA12021
Cape CharlesVIRGINIA12011

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