BirdAnalyst
Guild · Wisconsin · BBS 2026 Release · 1966–2025

Forest Birds In Wisconsin

All statesWisconsin

80 species in this guild. As a group they are +34%Guild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology → since 1968.

Guild 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 forest birds in Wisconsin. See the full index history below.

Forest Birds In Wisconsin Population Forecast

If the recent trend holds, Forest birds in Wisconsin is projected to stay roughly flat through 2030, near 5.6 (95% range 5.0–6.1). A 5-year backtest shows a typical error of ±8.7%, with 60% of held-out values landing inside the 95% band.

+8%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 →
5.6Projected 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 →
5.0–6.195% 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 →
±8.7%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, Forest birds in Wisconsin is projected to stay roughly flat through 2030, near 5.6 (95% range 5.0–6.1). A 5-year backtest shows a typical error of ±8.7%, with 60% 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 →
20265.54.96.0
20275.55.06.0
20285.55.06.1
20295.55.06.1
20305.65.06.1

Member Species In Wisconsin

Forest birds species in Wisconsin.
TrendPercent 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 →
Pine SiskinFringillidae-82%
Canada JayCorvidae-72%
Field SparrowPasserellidae-72%
Red-headed WoodpeckerPicidae-72%
Ruby-crowned KingletRegulidae-61%
Brown ThrasherMimidae-54%
Swainson's ThrushTurdidae-54%
Bell's VireoVireonidae-51%
Boreal ChickadeeParidae-44%
Palm WarblerParulidae-44%
Evening GrosbeakFringillidae-42%
Black-billed CuckooCuculidae-40%
Marsh WrenTroglodytidae-40%
Connecticut WarblerParulidae-37%
Yellow-billed CuckooCuculidae-36%
Yellow-breasted ChatIcteriidae-31%
Purple FinchFringillidae-28%
Tennessee WarblerParulidae-25%
Baltimore OrioleIcteridae-21%
Scarlet TanagerCardinalidae-18%
Warbling VireoVireonidae-14%
Song SparrowPasserellidae-13%
Cerulean WarblerParulidae-10%
American GoldfinchFringillidae-9%
Eastern TowheePasserellidae-7%
Eastern BluebirdTurdidae+2%
Blue JayCorvidae+4%
Canada WarblerParulidae+4%
Rose-breasted GrosbeakCardinalidae+8%
White-throated SparrowPasserellidae+16%
VeeryTurdidae+18%
Hooded WarblerParulidae+25%
Golden-winged WarblerParulidae+29%
Golden-crowned KingletRegulidae+33%
Mourning WarblerParulidae+35%
Cedar WaxwingBombycillidae+47%
Common YellowthroatParulidae+48%
Gray CatbirdMimidae+48%
Red CrossbillFringillidae+50%
Indigo BuntingCardinalidae+58%
American RobinTurdidae+63%
Yellow WarblerParulidae+68%
Nashville WarblerParulidae+77%
Northern House WrenTroglodytidae+79%
Black-throated Green WarblerParulidae+80%
OvenbirdParulidae+82%
Chipping SparrowPasserellidae+86%
White-breasted NuthatchSittidae+90%
Winter WrenTroglodytidae+100%
Wood ThrushTurdidae+101%
Hermit ThrushTurdidae+111%
Chestnut-sided WarblerParulidae+112%
White-winged CrossbillFringillidae+114%
Yellow-throated VireoVireonidae+115%
Lincoln's SparrowPasserellidae+116%
Downy WoodpeckerPicidae+123%
Northern ParulaParulidae+124%
Cape May WarblerParulidae+127%
Blackburnian WarblerParulidae+134%
Tufted TitmouseParidae+146%
Red-eyed VireoVireonidae+178%
Black-capped ChickadeeParidae+201%
Hairy WoodpeckerPicidae+204%
Northern CardinalCardinalidae+226%
Brown CreeperCerthiidae+232%
American RedstartParulidae+237%
Ruby-throated HummingbirdTrochilidae+257%
Black-and-white WarblerParulidae+297%
Blue-winged WarblerParulidae+326%
Magnolia WarblerParulidae+332%
Pileated WoodpeckerPicidae+341%
Yellow-bellied SapsuckerPicidae+371%
Black-throated Blue WarblerParulidae+392%
Blue-headed VireoVireonidae+443%
Northern WaterthrushParulidae+503%
Red-bellied WoodpeckerPicidae+761%
Blue-gray GnatcatcherPolioptilidae16×
Red-breasted NuthatchSittidae16×
Pine WarblerParulidae22×
Orchard OrioleIcteridae23×

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