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

Forest Birds In Colorado

All statesColorado

79 species in this guild. As a group they are +20%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 Colorado. See the full index history below.

Forest Birds In Colorado Population Forecast

If the recent trend holds, Forest birds in Colorado is projected to stay roughly flat through 2030, near 2.1 (95% range 1.7–2.5). A 5-year backtest shows a typical error of ±10.6%, with 100% of held-out values landing inside the 95% band.

+4%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 →
2.1Projected 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 →
1.7–2.595% 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 →
±10.6%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, Forest birds in Colorado is projected to stay roughly flat through 2030, near 2.1 (95% range 1.7–2.5). A 5-year backtest shows a typical error of ±10.6%, 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 →
20262.11.72.5
20272.11.72.5
20282.11.72.5
20292.11.72.5
20302.11.72.5

Member Species In Colorado

Forest birds species in Colorado.
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 →
Band-tailed PigeonColumbidae-93%
Yellow-billed CuckooCuculidae-89%
VeeryTurdidae-88%
Brown ThrasherMimidae-81%
Baltimore OrioleIcteridae-74%
Eastern BluebirdTurdidae-74%
Marsh WrenTroglodytidae-69%
Indigo BuntingCardinalidae-64%
Red-headed WoodpeckerPicidae-48%
Downy WoodpeckerPicidae-42%
Juniper TitmouseParidae-37%
Ladder-backed WoodpeckerPicidae-34%
Pygmy NuthatchSittidae-32%
Canyon WrenTroglodytidae-30%
Wilson's WarblerParulidae-23%
Steller's JayCorvidae-23%
Brown CreeperCerthiidae-22%
Golden-crowned KingletRegulidae-14%
Lewis's WoodpeckerPicidae-14%
Gray CatbirdMimidae-11%
American Three-toed WoodpeckerPicidae-10%
Yellow-breasted ChatIcteriidae-7%
Song SparrowPasserellidae-7%
Yellow WarblerParulidae-5%
Orchard OrioleIcteridae-4%
Broad-tailed HummingbirdTrochilidae-1%
Pine GrosbeakFringillidae+12%
Evening GrosbeakFringillidae+15%
American RobinTurdidae+17%
MacGillivray's WarblerParulidae+19%
Pine SiskinFringillidae+30%
Blue JayCorvidae+34%
Canada JayCorvidae+35%
Plumbeous VireoVireonidae+50%
Black-chinned HummingbirdTrochilidae+60%
Northern House WrenTroglodytidae+67%
Green-tailed TowheePasserellidae+68%
Western BluebirdTurdidae+71%
Blue GrosbeakCardinalidae+76%
Black-capped ChickadeeParidae+81%
Townsend's SolitaireTurdidae+89%
Woodhouse's Scrub-JayCorvidae+90%
Mountain ChickadeeParidae+111%
Bewick's WrenTroglodytidae+122%
Western TanagerCardinalidae+133%
Red CrossbillFringillidae+135%
Bullock's OrioleIcteridae+140%
Williamson's SapsuckerPicidae+143%
Lincoln's SparrowPasserellidae+150%
Mountain BluebirdTurdidae+166%
Chipping SparrowPasserellidae+172%
Grace's WarblerParulidae+185%
Common YellowthroatParulidae+192%
American GoldfinchFringillidae+192%
Black-throated Gray WarblerParulidae+206%
White-breasted NuthatchSittidae+222%
Hairy WoodpeckerPicidae+241%
Red-naped SapsuckerPicidae+243%
Hermit ThrushTurdidae+247%
Swainson's ThrushTurdidae+255%
Black-headed GrosbeakCardinalidae+263%
Rock WrenTroglodytidae+266%
Lazuli BuntingCardinalidae+289%
Lesser GoldfinchFringillidae+290%
Cedar WaxwingBombycillidae+315%
Gray VireoVireonidae+323%
BushtitAegithalidae+341%
Warbling VireoVireonidae+353%
Pinyon JayCorvidae+355%
Virginia's WarblerParulidae+356%
Fox SparrowPasserellidae+433%
Red-breasted NuthatchSittidae+452%
Cassin's FinchFringillidae+488%
Orange-crowned WarblerParulidae+532%
White-crowned SparrowPasserellidae+557%
Blue-gray GnatcatcherPolioptilidae+651%
Ruby-crowned KingletRegulidae+763%
Spotted TowheePasserellidae20×
Clark's NutcrackerCorvidae21×

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