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Species · Massachusetts · BBS 2026 Release · 1966–2025

Common Yellowthroat Population Trend in Massachusetts

All statesForest birds

Common Yellowthroat in Massachusetts has edged down: down 11% on the route-weighted index since 1968.

-11%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 →
32Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Yellowthroat Trends in MassachusettsNotable 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 Common Yellowthroat in Massachusetts. See the full index history below.

Common Yellowthroat Population Forecast in Massachusetts

If the recent trend holds, Common Yellowthroat in Massachusetts is projected to fall about 20% by 2030 — from 16 in 2025 to a central estimate of 13 (95% range 8.7–17). A 5-year backtest shows a typical error of ±21.6%, with 80% of held-out values landing inside the 95% band.

-20%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 →
13Projected 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 →
8.7–1795% 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 →
±21.6%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, Common Yellowthroat in Massachusetts is projected to fall about 20% by 2030 — from 16 in 2025 to a central estimate of 13 (95% range 8.7–17). A 5-year backtest shows a typical error of ±21.6%, with 80% of held-out values landing inside the 95% band.19662030
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 →
2026149.218
2027139.118
2028139.018
2029138.918
2030138.717

Common Yellowthroat Survey Routes in Massachusetts

Routes recording Common Yellowthroat in Massachusetts.
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 →
Chesterfield4220251967
Pittsfield4020161967
Gay Head3320251996
Monterey2820252019
S Barre2620251968
N Orange2520251968
Belchertown2320251967
Cummington2320141968
Warren 22120252010
Ware River1920221993
Chilmark1819831969
Cheshire1819941969
Sheffield1820221969
Wellfleet1620071966
Princeton1619761969
Cummington 21620252015
Warren1420091968
Cape Cod Ns1420071989
E Pepperell1319941966
Wellfleet 21320252016
Brockton1220191967
Newburyport1220221967
Maynard1120251967
Hancock1120151997
N. Andover920251995

Common Yellowthroat Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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