BirdAnalyst
Guild · New Hampshire · BBS 2025 Release · 1966–2024

Forest Birds In New Hampshire

All statesNew Hampshire

55 species in this guild. As a group they are +13%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 2029, near 5.1 (95% range 4.4–5.9). A 5-year backtest shows a typical error of ±6.5%, with 100% of held-out values landing inside the 95% band.

-0%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 →
5.1Projected 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 →
4.4–5.995% 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 →
±6.5%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 2029, near 5.1 (95% range 4.4–5.9). A 5-year backtest shows a typical error of ±6.5%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20255.14.45.9
20265.14.45.9
20275.14.45.9
20285.14.45.9
20295.14.45.9

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 →
Wood ThrushTurdidae-88%
Canada WarblerParulidae-86%
Bay-breasted WarblerParulidae-82%
Boreal ChickadeeParidae-81%
Blackpoll WarblerParulidae-70%
Wilson's WarblerParulidae-68%
Cape May WarblerParulidae-66%
VeeryTurdidae-58%
Northern WaterthrushParulidae-55%
Nashville WarblerParulidae-45%
Magnolia WarblerParulidae-44%
American RobinTurdidae-44%
Blue-winged WarblerParulidae-29%
American RedstartParulidae-24%
Ruby-crowned KingletRegulidae-23%
Marsh WrenTroglodytidae-21%
Common YellowthroatParulidae-20%
Tennessee WarblerParulidae-9%
Black-and-white WarblerParulidae-7%
Swainson's ThrushTurdidae-4%
Bicknell's ThrushTurdidae+1%
Chestnut-sided WarblerParulidae+4%
Yellow WarblerParulidae+7%
Philadelphia VireoVireonidae+9%
OvenbirdParulidae+12%
Golden-winged WarblerParulidae+18%
Warbling VireoVireonidae+19%
Black-capped ChickadeeParidae+53%
Winter WrenTroglodytidae+60%
Mourning WarblerParulidae+69%
Hermit ThrushTurdidae+72%
Red-eyed VireoVireonidae+74%
Downy WoodpeckerPicidae+81%
Yellow-throated VireoVireonidae+99%
Northern House WrenTroglodytidae+103%
Hairy WoodpeckerPicidae+134%
Yellow-bellied SapsuckerPicidae+138%
Blue-gray GnatcatcherPolioptilidae+141%
Red-breasted NuthatchSittidae+146%
Black-throated Green WarblerParulidae+159%
Blackburnian WarblerParulidae+168%
Louisiana WaterthrushParulidae+173%
Golden-crowned KingletRegulidae+176%
Prairie WarblerParulidae+201%
Black-throated Blue WarblerParulidae+231%
White-breasted NuthatchSittidae+234%
Blue-headed VireoVireonidae+296%
Eastern BluebirdTurdidae+393%
Northern ParulaParulidae+609%
Brown CreeperCerthiidae+757%
Pileated WoodpeckerPicidae17×
Carolina WrenTroglodytidae20×
Red-bellied WoodpeckerPicidae44×
Pine WarblerParulidae58×
Tufted TitmouseParidae203×

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