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Species · Colorado · BBS 2025 Release · 1966–2024

Blue-gray Gnatcatcher Population Trend in Colorado

All statesForest birds

Blue-gray Gnatcatcher in Colorado has surged: up 647% on the route-weighted index since 1973.

+647%Since 1973
68Routes In State
53Years

Notable Blue-gray Gnatcatcher Trends in Colorado

long arc increasecomputed index

Blue-gray Gnatcatcher has surged in Colorado: up 647% on the route-weighted index since 1973.

Blue-gray Gnatcatcher Population Forecast in Colorado

If the recent trend holds, Blue-gray Gnatcatcher in Colorado is projected to rise about 10% by 2029 — from 2.0 in 2024 to a central estimate of 2.2 (95% range 1.6–2.8). A 5-year backtest shows a typical error of ±29.6%, with 80% of held-out values landing inside the 95% band.

+10%Change by 2029
2.2Projected 2029 index
1.6–2.895% range
±29.6%Backtest error
19692029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20252.01.42.7
20262.11.52.7
20272.11.52.7
20282.11.52.8
20292.21.62.8

Blue-gray Gnatcatcher Survey Routes in Colorado

Routes recording Blue-gray Gnatcatcher in Colorado.
Mesaverde Np3420241996
Wray Gulch3420231988
Douglas Pass2920241982
Baxter Pass2720241994
Angora1620241998
De Beque1420241992
Black Sulphur Cr1320242015
Rosevale1220242009
Animas1120001996
Dinosaur920241995
Wet Mtns.720241993
Nucla720242000
Delta620211973
Basin620241995
Ludlow620162006
Cortez 2520172009
Dolores Riv519971997
Maybell420241974
Guffey419971997
Westcliffe420151999
Cortez420081988
Great Divide320191980
Yampa320091975
Pagosa Spgs319821982
Pinon320241995

Blue-gray Gnatcatcher Population Trend in Other States

alabamaarizonaarkansascaliforniaconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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