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

Brown Creeper Population Trend in New Hampshire

All statesForest birds

Brown Creeper in New Hampshire has surged: up 858% on the route-weighted index since 1968.

+858%Since 1968TrendPercent 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 →
25Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Brown Creeper Trends in New HampshireNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Brown Creeper has surged in New Hampshire: up 858% on the route-weighted index since 1968.

Brown Creeper Population Forecast in New Hampshire

If the recent trend holds, Brown Creeper in New Hampshire is projected to fall about 42% by 2030 — from 1.7 in 2025 to a central estimate of 1.0 (95% range 0.45–1.6). A 5-year backtest shows a typical error of ±49.4%, with 0% of held-out values landing inside the 95% band.

-42%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 →
1.0Projected 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 →
0.45–1.695% 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 →
±49.4%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, Brown Creeper in New Hampshire is projected to fall about 42% by 2030 — from 1.7 in 2025 to a central estimate of 1.0 (95% range 0.45–1.6). A 5-year backtest shows a typical error of ±49.4%, with 0% 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 →
20260.950.401.5
20270.960.411.5
20280.980.431.5
20290.990.441.5
20301.00.451.6

Brown Creeper Survey Routes in New Hampshire

Routes recording Brown Creeper in New Hampshire.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Franconia620251966
Canterbury420241976
Walpole420251970
Marlow420251976
Peterborough320251966
Dover320251985
Concord320251970
Gilmantn I W320241972
Lempster320241970
Clarksville320251988
Glen320251981
Fitzwilliam220251967
Hopkinton220221970
Strafford220251970
Wilmot220251977
Mt Chocorua220251969
Jefferson Hl220241966
Jeffers Ntch220091993
Brentwood119971981
Epsom120251982
Milan120252003
Stratford120231995
Dixvil Notch120151969
East Kingston120142000
Dixville Notch 2120252019

Brown Creeper Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutidahoillinoisindianaiowamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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