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

American Robin Population Trend in Colorado

All statesForest birds

American Robin in Colorado has edged up: up 17% on the route-weighted index since 1970.

+17%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 →
156Routes 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 American Robin Trends in ColoradoNotable 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 American Robin in Colorado. See the full index history below.

American Robin Population Forecast in Colorado

If the recent trend holds, American Robin in Colorado is projected to stay roughly flat through 2030, near 27 (95% range 20–34). A 5-year backtest shows a typical error of ±6.7%, with 100% of held-out values landing inside the 95% band.

+6%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 →
27Projected 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 →
20–3495% 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 →
±6.7%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, American Robin in Colorado is projected to stay roughly flat through 2030, near 27 (95% range 20–34). A 5-year backtest shows a typical error of ±6.7%, 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 →
2026272033
2027272033
2028272033
2029272033
2030272034

American Robin Survey Routes in Colorado

Routes recording American Robin in Colorado.
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 →
Yampa19320231969
Deadman Rd.11120251992
Stillwater Pass10720091998
Castleton8420251988
Dolores Riv7620251988
Mcphee Res.7520251996
Cokedale7120251995
Heeney 26720252025
Rifle Falls6320251998
Douglas Pass6220241982
Stillwater Pass 26220252010
Fox Creek5820251993
Elbert5720251998
Marshall Pas5620191995
Yellowjacket Pass5420251998
Aspen5320251979
Gribbles Prk5320251994
Haycamp Mesa5220251998
Red Cliff5120251989
Tarryall5120251988
Guanella Pas5020251992
Tincup5020251992
Pagosa Spgs4919821968
Wet Mtns.4820251993
Blackhead Pk4720251991

American Robin Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniaconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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