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

Forest Birds In Utah

All statesUtah

38 species in this guild. As a group they are -19%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 Utah. See the full index history below.

Forest Birds In Utah Population Forecast

If the recent trend holds, Forest birds in Utah is projected to fall about 12% by 2029 — from 1.6 in 2024 to a central estimate of 1.4 (95% range 0.11–2.7). A 5-year backtest shows a typical error of ±11.7%, with 100% of held-out values landing inside the 95% band.

-12%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 →
1.4Projected 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 →
0.11–2.795% 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 →
±11.7%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 Utah is projected to fall about 12% by 2029 — from 1.6 in 2024 to a central estimate of 1.4 (95% range 0.11–2.7). A 5-year backtest shows a typical error of ±11.7%, 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 →
20251.50.172.7
20261.40.152.7
20271.40.142.7
20281.40.122.7
20291.40.112.7

Member Species In Utah

Forest birds species in Utah.
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 →
Canyon WrenTroglodytidae-95%
Swainson's ThrushTurdidae-92%
Lewis's WoodpeckerPicidae-81%
Wilson's WarblerParulidae-81%
Virginia's WarblerParulidae-78%
Pygmy NuthatchSittidae-71%
Townsend's SolitaireTurdidae-69%
Orange-crowned WarblerParulidae-57%
Black-capped ChickadeeParidae-57%
Brown CreeperCerthiidae-50%
Downy WoodpeckerPicidae-39%
White-breasted NuthatchSittidae-36%
Hairy WoodpeckerPicidae-24%
Western BluebirdTurdidae-20%
Black-throated Gray WarblerParulidae-18%
Golden-crowned KingletRegulidae-8%
Bewick's WrenTroglodytidae-8%
Williamson's SapsuckerPicidae-7%
Juniper TitmouseParidae+0%
Mountain ChickadeeParidae+10%
American RobinTurdidae+11%
Gray VireoVireonidae+13%
Marsh WrenTroglodytidae+24%
Hermit ThrushTurdidae+29%
Grace's WarblerParulidae+40%
American Three-toed WoodpeckerPicidae+45%
Mountain BluebirdTurdidae+48%
Red-breasted NuthatchSittidae+167%
Red-naped SapsuckerPicidae+177%
Plumbeous VireoVireonidae+217%
Rock WrenTroglodytidae+232%
Common YellowthroatParulidae+333%
MacGillivray's WarblerParulidae+346%
Blue-gray GnatcatcherPolioptilidae+384%
Yellow WarblerParulidae+396%
Warbling VireoVireonidae+808%
Northern House WrenTroglodytidae+867%
Ruby-crowned KingletRegulidae13×

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