BirdAnalyst
Species · Vermont · BBS 2025 Release · 1966–2024

Common Raven Population Trend in Vermont

All statesGeneralists

Common Raven in Vermont has surged: up 26× on the route-weighted index since 1969.

26×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 →
26Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Raven Trends in VermontNotable 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 →

Common Raven has surged in Vermont: up 26× on the route-weighted index since 1969.

Common Raven Population Forecast in Vermont

If the recent trend holds, Common Raven in Vermont is projected to fall about 23% by 2029 — from 3.7 in 2024 to a central estimate of 2.9 (95% range 1.9–3.8). A 5-year backtest shows a typical error of ±22.2%, with 80% of held-out values landing inside the 95% band.

-23%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 →
2.9Projected 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 →
1.9–3.895% 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 →
±22.2%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, Common Raven in Vermont is projected to fall about 23% by 2029 — from 3.7 in 2024 to a central estimate of 2.9 (95% range 1.9–3.8). A 5-year backtest shows a typical error of ±22.2%, with 80% 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 →
20252.71.73.6
20262.71.83.7
20272.81.83.7
20282.81.93.8
20292.91.93.8

Common Raven Survey Routes in Vermont

Routes recording Common Raven in Vermont.
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 →
St Johnsbury1320241972
W Rutland920241986
Middlesex720241976
East Haven620241969
Hardwick520241966
Landgrove420241979
Post Mills320241976
S Wallingfrd320221981
Greensboro320241980
Fletcher320241975
Colchester320241991
Stowe320241988
North Pownal220242003
Gaysville220211977
East Calais220241978
Newbury220041986
Hinesburg219941972
Newbury 2220222005
Bristol220181995
Marlboro120241986
Stratton120241989
S Reading120241979
Shaftsbury120241992
Northfld Fls120181980
Waterville119741968

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvirginiawashingtonwest-virginiawisconsinwyoming

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