BirdAnalyst
Species · BCR 12 · BBS 2025 Release · 1966–2024

Wood Thrush In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Wood Thrush in Boreal Hardwood Transition has increased: up 37% on the route-weighted index since 1968.

+37%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 →
116Routes 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 Wood Thrush in Boreal Hardwood Transition. See the full index history below.

Wood Thrush In Boreal Hardwood Transition Population Forecast

If the recent trend holds, Wood Thrush in Boreal Hardwood Transition is projected to fall about 62% by 2029 — from 3.3 in 2024 to a central estimate of 1.2 (95% range 0.09–2.4). A 5-year backtest shows a typical error of ±62.1%, with 20% of held-out values landing inside the 95% band.

-62%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 →
0.09–2.495% 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 →
±62.1%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, Wood Thrush in Boreal Hardwood Transition is projected to fall about 62% by 2029 — from 3.3 in 2024 to a central estimate of 1.2 (95% range 0.09–2.4). A 5-year backtest shows a typical error of ±62.1%, with 20% 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 →
20251.30.162.5
20261.30.142.4
20271.30.132.4
20281.30.112.4
20291.20.092.4

Routes In Boreal Hardwood Transition

Routes recording Wood Thrush in Boreal Hardwood Transition.
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 →
Weirgor SpringsWISCONSIN302024
BigforkMINNESOTA192024
AmbergWISCONSIN162024
MellenWISCONSIN132024
ChaffeyWISCONSIN102024
BayfieldWISCONSIN102024
Brocky LakeMICHIGAN81995
Hubbard LakeMICHIGAN81989
Sherry LakeMINNESOTA82022
Land O LakesWISCONSIN82009
WausaukeeWISCONSIN82024
IsabellaMICHIGAN72012
WaskishMINNESOTA72024
Nett LakeMINNESOTA72024
Popple RiverWISCONSIN72024
FlambeauWISCONSIN72024
Crystal FlsMICHIGAN62024
Maple GroveMICHIGAN62024
Iron RiverWISCONSIN62024
Bear LakeMICHIGAN52024
HarriettaMICHIGAN52024
BackusMINNESOTA52024
Red LakeMINNESOTA52024
HollisterWISCONSIN52024
BerglandMICHIGAN42022

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