BirdAnalyst
Guild · Colorado · BBS 2025 Release · 1966–2024

Forest Birds In Colorado

All statesColorado

42 species in this guild. As a group they are +10%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 rise about 14% by 2029 — from 1.9 in 2024 to a central estimate of 2.2 (95% range 1.8–2.6). A 5-year backtest shows a typical error of ±12.7%, with 100% of held-out values landing inside the 95% band.

+14%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 →
2.2Projected 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 →
1.8–2.695% 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 →
±12.7%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 Colorado is projected to rise about 14% by 2029 — from 1.9 in 2024 to a central estimate of 2.2 (95% range 1.8–2.6). A 5-year backtest shows a typical error of ±12.7%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20252.21.72.6
20262.21.72.6
20272.21.72.6
20282.21.82.6
20292.21.82.6

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 →
VeeryTurdidae-87%
Eastern BluebirdTurdidae-74%
Marsh WrenTroglodytidae-66%
Downy WoodpeckerPicidae-47%
Red-headed WoodpeckerPicidae-47%
Lewis's WoodpeckerPicidae-46%
Juniper TitmouseParidae-42%
Canyon WrenTroglodytidae-35%
Ladder-backed WoodpeckerPicidae-34%
Brown CreeperCerthiidae-29%
Pygmy NuthatchSittidae-27%
Golden-crowned KingletRegulidae-20%
Yellow WarblerParulidae-9%
Wilson's WarblerParulidae-8%
MacGillivray's WarblerParulidae+8%
American Three-toed WoodpeckerPicidae+8%
American RobinTurdidae+20%
Plumbeous VireoVireonidae+41%
Western BluebirdTurdidae+52%
Northern House WrenTroglodytidae+69%
Black-capped ChickadeeParidae+84%
Bewick's WrenTroglodytidae+92%
Townsend's SolitaireTurdidae+93%
Mountain ChickadeeParidae+119%
Grace's WarblerParulidae+151%
Williamson's SapsuckerPicidae+164%
Mountain BluebirdTurdidae+166%
Common YellowthroatParulidae+168%
Swainson's ThrushTurdidae+200%
White-breasted NuthatchSittidae+210%
Red-naped SapsuckerPicidae+211%
Black-throated Gray WarblerParulidae+215%
Hairy WoodpeckerPicidae+251%
Rock WrenTroglodytidae+252%
Hermit ThrushTurdidae+277%
Virginia's WarblerParulidae+321%
Warbling VireoVireonidae+332%
Gray VireoVireonidae+374%
Orange-crowned WarblerParulidae+416%
Red-breasted NuthatchSittidae+440%
Blue-gray GnatcatcherPolioptilidae+647%
Ruby-crowned KingletRegulidae+823%

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