BirdAnalyst
Guild · New Hampshire · BBS 2026 Release · 1966–2025

Forest Birds In New Hampshire

All statesNew Hampshire

80 species in this guild. As a group they are -2%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 1968.

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 New Hampshire. See the full index history below.

Forest Birds In New Hampshire Population Forecast

If the recent trend holds, Forest birds in New Hampshire is projected to stay roughly flat through 2030, near 5.0 (95% range 4.3–5.8). A 5-year backtest shows a typical error of ±5.7%, with 80% of held-out values landing inside the 95% band.

-1%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 →
5.0Projected 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 →
4.3–5.895% 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 →
±5.7%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 New Hampshire is projected to stay roughly flat through 2030, near 5.0 (95% range 4.3–5.8). A 5-year backtest shows a typical error of ±5.7%, with 80% of held-out values landing inside the 95% band.19662030
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 →
20265.14.35.8
20275.04.35.8
20285.04.35.8
20295.04.35.8
20305.04.35.8

Member Species In New Hampshire

Forest birds species in New Hampshire.
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 →
Eastern TowheePasserellidae-97%
Brown ThrasherMimidae-93%
Field SparrowPasserellidae-89%
Black-billed CuckooCuculidae-87%
Wood ThrushTurdidae-86%
Pine SiskinFringillidae-86%
Canada WarblerParulidae-86%
Bay-breasted WarblerParulidae-82%
Boreal ChickadeeParidae-81%
White-throated SparrowPasserellidae-79%
Evening GrosbeakFringillidae-79%
Lincoln's SparrowPasserellidae-75%
Blackpoll WarblerParulidae-70%
Baltimore OrioleIcteridae-68%
Wilson's WarblerParulidae-68%
Cape May WarblerParulidae-67%
VeeryTurdidae-62%
Purple FinchFringillidae-61%
Rose-breasted GrosbeakCardinalidae-56%
Northern WaterthrushParulidae-53%
Ruby-crowned KingletRegulidae-53%
Blue JayCorvidae-53%
Nashville WarblerParulidae-49%
American RobinTurdidae-45%
Magnolia WarblerParulidae-38%
Blue-winged WarblerParulidae-30%
American RedstartParulidae-28%
Marsh WrenTroglodytidae-22%
Common YellowthroatParulidae-22%
Scarlet TanagerCardinalidae-10%
Philadelphia VireoVireonidae-10%
Tennessee WarblerParulidae-9%
Black-and-white WarblerParulidae-8%
Swainson's ThrushTurdidae-6%
American GoldfinchFringillidae+0%
Song SparrowPasserellidae+1%
Chestnut-sided WarblerParulidae+1%
Bicknell's ThrushTurdidae+1%
Gray CatbirdMimidae+2%
Yellow-billed CuckooCuculidae+7%
OvenbirdParulidae+10%
Yellow WarblerParulidae+14%
Golden-winged WarblerParulidae+18%
Warbling VireoVireonidae+22%
Cedar WaxwingBombycillidae+33%
Orchard OrioleIcteridae+34%
Winter WrenTroglodytidae+50%
Hermit ThrushTurdidae+52%
Black-capped ChickadeeParidae+54%
Canada JayCorvidae+58%
Mourning WarblerParulidae+67%
Downy WoodpeckerPicidae+71%
Chipping SparrowPasserellidae+71%
Red-eyed VireoVireonidae+71%
Ruby-throated HummingbirdTrochilidae+92%
Hairy WoodpeckerPicidae+93%
Yellow-throated VireoVireonidae+95%
Yellow-bellied SapsuckerPicidae+97%
Northern House WrenTroglodytidae+100%
Red-breasted NuthatchSittidae+123%
Black-throated Green WarblerParulidae+131%
Black-throated Blue WarblerParulidae+134%
Indigo BuntingCardinalidae+150%
Prairie WarblerParulidae+152%
Blackburnian WarblerParulidae+166%
Golden-crowned KingletRegulidae+171%
Red CrossbillFringillidae+197%
Blue-headed VireoVireonidae+206%
White-breasted NuthatchSittidae+208%
Blue-gray GnatcatcherPolioptilidae+211%
Louisiana WaterthrushParulidae+321%
Eastern BluebirdTurdidae+437%
Northern ParulaParulidae+597%
Brown CreeperCerthiidae+858%
Pileated WoodpeckerPicidae15×
Carolina WrenTroglodytidae28×
Red-bellied WoodpeckerPicidae47×
Pine WarblerParulidae55×
Northern CardinalCardinalidae189×
Tufted TitmouseParidae205×

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