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

Loggerhead Shrike Population Trend in Montana

All statesGrassland birds

Loggerhead Shrike in Montana has edged down: down 18% on the route-weighted index since 1970.

-18%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 →
55Routes 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 Loggerhead Shrike 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 →

No notable trend signals for Loggerhead Shrike in Montana. See the full index history below.

Loggerhead Shrike Population Forecast in Montana

If the recent trend holds, Loggerhead Shrike in Montana is projected to fall about 24% by 2030 — from 0.78 in 2025 to a central estimate of 0.59 (95% range 0.08–1.1). A 5-year backtest shows a typical error of ±32.7%, with 100% of held-out values landing inside the 95% band.

-24%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 →
0.59Projected 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 →
0.08–1.195% 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 →
±32.7%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, Loggerhead Shrike in Montana is projected to fall about 24% by 2030 — from 0.78 in 2025 to a central estimate of 0.59 (95% range 0.08–1.1). A 5-year backtest shows a typical error of ±32.7%, with 100% 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 →
20260.600.091.1
20270.600.091.1
20280.600.081.1
20290.590.081.1
20300.590.081.1

Loggerhead Shrike Survey Routes in Montana

Routes recording Loggerhead Shrike 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 →
Glasgow1020251968
Lindsay820242015
Ingomar720251970
Chinook720252015
Brusett620241982
Circle520231969
Albion520251982
Whitlash520242009
Jordan420241968
Locate420251981
Cabin Creek420252018
Redstone320241972
Savage320251968
Powderville320251970
Jordan South320252016
Flatwillow 2220212014
Sunburst220061973
Harlem220181968
Oswego220251978
Greenough219961996
Webster220251979
Brandenberg220251968
Custer 2220242024
Gildford220192015
Sun River220172017

Loggerhead Shrike Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradofloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmichiganminnesotamississippimissourinebraskanevadanew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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