BirdAnalyst
Species · BCR 12 · BBS 2026 Release · 1966–2025

Wood Thrush In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Wood Thrush in Boreal Hardwood Transition has risen sharply: up 68% on the route-weighted index since 1968.

+68%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 →
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 SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Wood Thrush has risen sharply in Boreal Hardwood Transition: up 68% on the route-weighted index since 1968.

Wood Thrush In Boreal Hardwood Transition Population Forecast

If the recent trend holds, Wood Thrush in Boreal Hardwood Transition is projected to fall about 65% by 2030 — from 4.2 in 2025 to a central estimate of 1.4 (95% range 0.10–2.8). A 5-year backtest shows a typical error of ±64.3%, with 20% of held-out values landing inside the 95% band.

-65%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 →
1.4Projected 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 →
0.10–2.895% 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 →
±64.3%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 65% by 2030 — from 4.2 in 2025 to a central estimate of 1.4 (95% range 0.10–2.8). A 5-year backtest shows a typical error of ±64.3%, with 20% 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 →
20261.50.142.8
20271.50.132.8
20281.50.122.8
20291.50.112.8
20301.40.102.8

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 SpringsWISCONSIN332025
Popple RiverWISCONSIN202025
MellenWISCONSIN182025
Pleasant Valley 2MICHIGAN152025
BigforkMINNESOTA142025
WausaukeeWISCONSIN132025
CavourWISCONSIN112025
Red LakeMINNESOTA102025
Amnicon FallsWISCONSIN102025
FlambeauWISCONSIN92025
Brocky LakeMICHIGAN81995
Hubbard LakeMICHIGAN81989
Sherry LakeMINNESOTA82022
Land O LakesWISCONSIN82009
Crystal FlsMICHIGAN72025
IsabellaMICHIGAN72012
FloodwoodMINNESOTA72025
WaskishMINNESOTA72025
Nett LakeMINNESOTA72024
MinongWISCONSIN72025
Rib LakeWISCONSIN72025
Union TwpWISCONSIN62025
CouderayWISCONSIN62025
CrandonWISCONSIN62025
HollisterWISCONSIN62025

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