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Species · BCR 14 · BBS 2025 Release · 1966–2024

Great Horned Owl In Atlantic Northern Forest

All regionsAtlantic Northern ForestGeneralists

Great Horned Owl in Atlantic Northern Forest has edged up: up 14% on the route-weighted index since 1976.

+14%Since 1976TrendPercent 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 →
38Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
33YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable 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 Great Horned Owl in Atlantic Northern Forest. See the full index history below.

Forecast

If the recent trend holds, Great Horned Owl in Atlantic Northern Forest is projected to stay roughly flat through 2024, near 0.02 (95% range 0.00–0.04). A 5-year backtest shows a typical error of ±39.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2024TrendPercent 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 →
0.02Projected 2024 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0495% 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 →
±39.4%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, Great Horned Owl in Atlantic Northern Forest is projected to stay roughly flat through 2024, near 0.02 (95% range 0.00–0.04). A 5-year backtest shows a typical error of ±39.4%, with 100% of held-out values landing inside the 95% band.19692024
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 →
20200.020.000.05
20210.020.000.05
20220.020.000.05
20230.020.000.04
20240.020.000.04

Routes In Atlantic Northern Forest

Routes recording Great Horned Owl in Atlantic Northern Forest.
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 →
South ArmMAINE21992
Bowdoin CtrMAINE21980
BrooksMAINE21995
ClarksvilleNEW-HAMPSHIRE22006
PetersburgNEW-YORK22010
W RutlandVERMONT22016
Northfld FlsVERMONT21990
New HartfordCONNECTICUT11985
New HartfordCONNECTICUT12012
WestbrookMAINE11994
BiddefordMAINE11999
BethelMAINE12010
GreenwoodMAINE12017
ReedsMAINE11983
WarrenMAINE11982
HancockMAINE11976
CooperMAINE12017
DebloisMAINE11980
BenedictaMAINE11993
HudsonMAINE11983
Weeks BrookMAINE11997
Priestly Br.MAINE12000
RomeMAINE12019
CummingtonMASSACHUSETTS11991
ChesterfieldMASSACHUSETTS12006

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