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

Magnolia Warbler In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastForest birds

Magnolia Warbler in New England / Mid-Atlantic Coast has held roughly steady: down 6% on the route-weighted index since 1969.

-6%Since 1969TrendPercent 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 →
22Routes 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 →
46YearsYears 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 Magnolia Warbler in New England / Mid-Atlantic Coast. See the full index history below.

Magnolia Warbler In New England / Mid-Atlantic Coast Population Forecast

If the recent trend holds, Magnolia Warbler in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±91.8%, with 100% 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 →
0.03Projected 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 →
0.00–0.0895% 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 →
±91.8%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, Magnolia Warbler in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±91.8%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20250.030.000.08
20260.030.000.08
20270.030.000.08
20280.030.000.08
20290.030.000.08

Routes In New England / Mid-Atlantic Coast

Routes recording Magnolia Warbler 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 →
ShermanCONNECTICUT22011
E HartlandCONNECTICUT11990
BuckinghamCONNECTICUT12002
WestbrookCONNECTICUT11980
No WoodburyCONNECTICUT12000
WarrenCONNECTICUT12011
Woodstock 2CONNECTICUT12021
GranbyCONNECTICUT12024
Cape NeddickMAINE11972
Kittery PtMAINE11996
MansfieldMASSACHUSETTS12002
PrincetonMASSACHUSETTS11976
E PepperellMASSACHUSETTS11967
BelchertownMASSACHUSETTS12024
WarrenMASSACHUSETTS12002
S BarreMASSACHUSETTS11986
HoldenMASSACHUSETTS12002
Ware RiverMASSACHUSETTS12012
BrentwoodNEW-HAMPSHIRE11977
DoverNEW-HAMPSHIRE11982
EpsomNEW-HAMPSHIRE11992
StraffordNEW-HAMPSHIRE12018

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