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

Forest Birds In Montana

All statesMontana

45 species in this guild. As a group they are +15%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 Montana. See the full index history below.

Forest Birds In Montana Population Forecast

If the recent trend holds, Forest birds in Montana is projected to rise about 16% 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 ±15.2%, with 60% of held-out values landing inside the 95% band.

+16%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 →
±15.2%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 Montana is projected to rise about 16% 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 ±15.2%, with 60% 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 →
20252.21.82.6
20262.21.82.6
20272.21.82.6
20282.21.82.6
20292.21.82.6

Member Species In Montana

Forest birds species in Montana.
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 →
Pygmy NuthatchSittidae-78%
White-breasted NuthatchSittidae-74%
VeeryTurdidae-66%
Plumbeous VireoVireonidae-63%
Red-eyed VireoVireonidae-54%
Townsend's SolitaireTurdidae-53%
Black-backed WoodpeckerPicidae-52%
Williamson's SapsuckerPicidae-43%
Lewis's WoodpeckerPicidae-40%
American Three-toed WoodpeckerPicidae-37%
Downy WoodpeckerPicidae-37%
Western BluebirdTurdidae-32%
Red-headed WoodpeckerPicidae-32%
Wilson's WarblerParulidae-18%
Cassin's VireoVireonidae-6%
Common YellowthroatParulidae-5%
Varied ThrushTurdidae+12%
Tennessee WarblerParulidae+12%
Rock WrenTroglodytidae+15%
American RedstartParulidae+22%
Mountain BluebirdTurdidae+24%
American RobinTurdidae+26%
Brown CreeperCerthiidae+36%
Chestnut-backed ChickadeeParidae+39%
Ruby-crowned KingletRegulidae+51%
Orange-crowned WarblerParulidae+65%
Black-capped ChickadeeParidae+72%
Yellow WarblerParulidae+76%
Pileated WoodpeckerPicidae+96%
MacGillivray's WarblerParulidae+101%
Northern House WrenTroglodytidae+106%
Warbling VireoVireonidae+121%
Mountain ChickadeeParidae+130%
Swainson's ThrushTurdidae+163%
Marsh WrenTroglodytidae+181%
Townsend's WarblerParulidae+183%
OvenbirdParulidae+295%
Nashville WarblerParulidae+444%
Pacific WrenTroglodytidae+463%
Hairy WoodpeckerPicidae+467%
Red-naped SapsuckerPicidae+587%
Northern WaterthrushParulidae+592%
Red-breasted NuthatchSittidae+625%
Hermit ThrushTurdidae+804%
Golden-crowned KingletRegulidae11×

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