BirdAnalyst
Species · Montana · BBS 2026 Release · 1966–2025

Common Raven Population Trend in Montana

All statesGeneralists

Common Raven in Montana has surged: up 342% on the route-weighted index since 1970.

+342%Since 1970TrendPercent 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 →
96Routes 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 Common Raven Trends in MontanaNotable 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 Montana: up 342% on the route-weighted index since 1970.

Common Raven Population Forecast in Montana

If the recent trend holds, Common Raven in Montana is projected to stay roughly flat through 2030, near 5.9 (95% range 4.4–7.3). A 5-year backtest shows a typical error of ±22.2%, with 80% of held-out values landing inside the 95% band.

+8%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 →
5.9Projected 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 →
4.4–7.395% 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 Montana is projected to stay roughly flat through 2030, near 5.9 (95% range 4.4–7.3). A 5-year backtest shows a typical error of ±22.2%, with 80% of held-out values landing inside the 95% band.19682030
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 →
20265.64.17.0
20275.64.27.1
20285.74.37.2
20295.84.37.3
20305.94.47.3

Common Raven Survey Routes in Montana

Routes recording Common Raven in Montana.
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 →
Church Hill5020252017
Red Rock2220251974
Elliston1720251968
Beaverhead1720251975
Libby Dam1620251979
Lima1420251994
Brunzell Slough1320252015
Boulder1220251975
Clyde Park1220252018
Kalispell1120251968
Polson1120251977
Brusett1020242017
Chestnut1020251974
Noxon1020231995
East Glacier Park1020252015
Winnett1020252017
Clancy1020252015
Roundup1020252016
Wheat Basin1020252017
Shawmut920251999
Ninemile920251993
Fish Creek920241995
Philipsburg920252015
Freeman Creek920162015
Greenough920041995

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemarylandmassachusettsmichiganminnesotanebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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