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

Forest Birds In Idaho

All statesIdaho

75 species in this guild. As a group they are -22%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 1970.

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 Idaho. See the full index history below.

Forest Birds In Idaho Population Forecast

If the recent trend holds, Forest birds in Idaho is projected to fall about 26% by 2030 — from 2.6 in 2025 to a central estimate of 1.9 (95% range 1.0–2.8). A 5-year backtest shows a typical error of ±26.9%, with 100% of held-out values landing inside the 95% band.

-26%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 →
1.9Projected 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 →
1.0–2.895% 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 →
±26.9%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 Idaho is projected to fall about 26% by 2030 — from 2.6 in 2025 to a central estimate of 1.9 (95% range 1.0–2.8). A 5-year backtest shows a typical error of ±26.9%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20262.01.02.9
20271.91.02.9
20281.91.02.9
20291.91.02.8
20301.91.02.8

Member Species In Idaho

Forest birds species in Idaho.
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 →
White-breasted NuthatchSittidae-89%
Plumbeous VireoVireonidae-88%
Evening GrosbeakFringillidae-83%
Juniper TitmouseParidae-82%
Pygmy NuthatchSittidae-72%
Downy WoodpeckerPicidae-72%
Pine GrosbeakFringillidae-71%
American RedstartParulidae-71%
Steller's JayCorvidae-69%
Brown CreeperCerthiidae-56%
Black-backed WoodpeckerPicidae-50%
Northern WaterthrushParulidae-48%
Rufous HummingbirdTrochilidae-44%
Canyon WrenTroglodytidae-35%
Townsend's SolitaireTurdidae-35%
American RobinTurdidae-33%
American Three-toed WoodpeckerPicidae-29%
Western BluebirdTurdidae-27%
Hairy WoodpeckerPicidae-24%
White-crowned SparrowPasserellidae-21%
Williamson's SapsuckerPicidae-20%
Varied ThrushTurdidae-19%
Gray CatbirdMimidae-18%
Clark's NutcrackerCorvidae-16%
Mountain BluebirdTurdidae-14%
Black-capped ChickadeeParidae-13%
Black-throated Gray WarblerParulidae-12%
Mountain ChickadeeParidae+1%
American GoldfinchFringillidae+2%
VeeryTurdidae+5%
Marsh WrenTroglodytidae+10%
Yellow WarblerParulidae+38%
Blue-gray GnatcatcherPolioptilidae+52%
Bullock's OrioleIcteridae+64%
Red-naped SapsuckerPicidae+66%
Canada JayCorvidae+66%
Chipping SparrowPasserellidae+94%
Song SparrowPasserellidae+94%
Lesser GoldfinchFringillidae+99%
Hermit ThrushTurdidae+103%
Calliope HummingbirdTrochilidae+111%
Cedar WaxwingBombycillidae+115%
MacGillivray's WarblerParulidae+137%
Nashville WarblerParulidae+143%
Swainson's ThrushTurdidae+155%
Warbling VireoVireonidae+165%
Spotted TowheePasserellidae+170%
Lewis's WoodpeckerPicidae+171%
Black-chinned HummingbirdTrochilidae+173%
BushtitAegithalidae+177%
Pine SiskinFringillidae+185%
Cassin's VireoVireonidae+187%
Orange-crowned WarblerParulidae+204%
Red-eyed VireoVireonidae+212%
Chestnut-backed ChickadeeParidae+219%
Common YellowthroatParulidae+223%
Green-tailed TowheePasserellidae+233%
Ruby-crowned KingletRegulidae+253%
Wilson's WarblerParulidae+279%
Pileated WoodpeckerPicidae+281%
Rock WrenTroglodytidae+320%
Red CrossbillFringillidae+323%
Fox SparrowPasserellidae+326%
Black-headed GrosbeakCardinalidae+354%
Western TanagerCardinalidae+402%
Red-breasted NuthatchSittidae+446%
Northern House WrenTroglodytidae+459%
Cassin's FinchFringillidae+528%
Yellow-breasted ChatIcteriidae+563%
Broad-tailed HummingbirdTrochilidae+570%
Pacific WrenTroglodytidae+572%
Lazuli BuntingCardinalidae+756%
Townsend's WarblerParulidae+802%
Golden-crowned KingletRegulidae+996%
Lincoln's SparrowPasserellidae12×

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