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

Barred Owl Population Trend in New Hampshire

All statesGeneralists

Barred Owl in New Hampshire has surged: up 363% on the route-weighted index since 1969.

+363%Since 1969TrendPercent 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 →
41YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Barred Owl 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 →

Barred Owl has surged in New Hampshire: up 363% on the route-weighted index since 1969.

Barred Owl Population Forecast in New Hampshire

If the recent trend holds, Barred Owl in New Hampshire is projected to fall about 65% by 2029 — from 0.68 in 2024 to a central estimate of 0.24 (95% range 0.00–0.48). A 5-year backtest shows a typical error of ±42.3%, with 60% of held-out values landing inside the 95% band.

-65%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 →
0.24Projected 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 →
0.00–0.4895% 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 →
±42.3%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, Barred Owl in New Hampshire is projected to fall about 65% by 2029 — from 0.68 in 2024 to a central estimate of 0.24 (95% range 0.00–0.48). A 5-year backtest shows a typical error of ±42.3%, with 60% 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 →
20250.230.000.47
20260.230.000.47
20270.230.000.47
20280.240.000.48
20290.240.000.48

Barred Owl Survey Routes in New Hampshire

Routes recording Barred Owl 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 →
Gilmantn I W520241993
Strafford420211966
Peterborough320211971
Brentwood319711971
Concord220242007
Marlow220241993
Fitzwilliam120221980
Dover120242012
Hopkinton120222022
Epsom120181980
Canterbury120241997
Wilmot120171972
Mt Chocorua120241967
Walpole120241977
Lempster120242016
Crawford Not119691969
Jefferson Hl120241995
Franconia120221969
Milan120081995
Stratford120092007
Dixvil Notch120152015
Clarksville120142014
Glen120171976
East Kingston120212003
Jeffers Ntch120092002

Barred Owl Population Trend in Other States

alabamaalaskaarkansascaliforniaconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-jerseynew-yorknorth-carolinaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawashingtonwest-virginiawisconsin

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