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

Brown Creeper Population Trend in New Hampshire

All statesForest birds

Brown Creeper in New Hampshire has surged: up 757% on the route-weighted index since 1968.

+757%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 →
57YearsYears 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 757% 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 48% by 2029 — from 1.8 in 2024 to a central estimate of 0.93 (95% range 0.41–1.4). A 5-year backtest shows a typical error of ±43%, with 20% of held-out values landing inside the 95% band.

-48%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 →
0.93Projected 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 →
0.41–1.495% 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 →
±43%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 48% by 2029 — from 1.8 in 2024 to a central estimate of 0.93 (95% range 0.41–1.4). A 5-year backtest shows a typical error of ±43%, with 20% 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 →
20250.880.361.4
20260.890.381.4
20270.900.391.4
20280.920.401.4
20290.930.411.4

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 →
Walpole620241970
Concord420241970
Canterbury420241976
Dover320241985
Gilmantn I W320241972
Lempster320241970
Glen320241981
Peterborough220211966
Fitzwilliam220241967
Hopkinton220221970
Jefferson Hl220241966
Franconia220241966
Jeffers Ntch220091993
Brentwood119971981
Epsom120191982
Strafford120241970
Wilmot120241977
Mt Chocorua120241969
Marlow120241976
Milan120242003
Stratford120231995
Dixvil Notch120151969
Clarksville120241988
East Kingston120142000
Dixville Notch 2120242019

Brown Creeper Population Trend in Other States

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

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