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Species · Montana · BBS 2025 Release · 1966–2024

Green-tailed Towhee Population Trend in Montana

All statesGeneralists

Green-tailed Towhee in Montana has declined: down 37% on the route-weighted index since 1970.

-37%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 →
22Routes 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 Green-tailed Towhee 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 Green-tailed Towhee in Montana. See the full index history below.

Green-tailed Towhee Population Forecast in Montana

If the recent trend holds, Green-tailed Towhee in Montana is projected to rise about 29% by 2029 — from 0.33 in 2024 to a central estimate of 0.42 (95% range 0.13–0.71). A 5-year backtest shows a typical error of ±29.5%, with 100% of held-out values landing inside the 95% band.

+29%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 →
0.42Projected 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 →
0.13–0.7195% 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 →
±29.5%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, Green-tailed Towhee in Montana is projected to rise about 29% by 2029 — from 0.33 in 2024 to a central estimate of 0.42 (95% range 0.13–0.71). A 5-year backtest shows a typical error of ±29.5%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.410.120.70
20260.410.120.70
20270.420.130.71
20280.420.130.71
20290.420.130.71

Green-tailed Towhee Survey Routes in Montana

Routes recording Green-tailed Towhee 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 →
Pryor Mtn.1320241995
Beaverhead520241991
Hebgen Lake520242017
Leroy320191980
Clyde Park320232018
Lima320241994
Bull Mtn.220142013
Red Rock220231980
Clancy220182015
Glen120062006
Willow Creek 2120242012
Boulder120241969
Two Dot120152015
Shawmut119941994
Chestnut120231968
Reed Point120221977
Laurel120051985
St Xavier120092006
Fort Logan120222018
Powderville119911991
Brunzell Slough120222021
Wise River120182018

Green-tailed Towhee Population Trend in Other States

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