BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Dickcissel Population Trend in Colorado

All statesGrassland birds

Dickcissel in Colorado has surged: up 434% on the route-weighted index since 1974.

+434%Since 1974TrendPercent 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 →
41Routes 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 →
46YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Dickcissel 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 →

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 →

Dickcissel has surged in Colorado: up 434% on the route-weighted index since 1974.

Dickcissel Population Forecast in Colorado

If the recent trend holds, Dickcissel in Colorado is projected to fall about 25% by 2029 — from 1.3 in 2024 to a central estimate of 0.94 (95% range 0.24–1.6). A 5-year backtest shows a typical error of ±68.8%, with 100% of held-out values landing inside the 95% band.

-25%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 →
0.94Projected 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 →
0.24–1.695% 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 →
±68.8%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, Dickcissel in Colorado is projected to fall about 25% by 2029 — from 1.3 in 2024 to a central estimate of 0.94 (95% range 0.24–1.6). A 5-year backtest shows a typical error of ±68.8%, with 100% of held-out values landing inside the 95% band.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 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 →
20250.860.171.6
20260.880.191.6
20270.900.211.6
20280.920.231.6
20290.940.241.6

Dickcissel Survey Routes in Colorado

Routes recording Dickcissel 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 →
Pritchett2420241995
Pinneo1920181983
Wildhorse L1620242005
Fort Morgan1520241999
Julesburg1420211998
Haswell1320241994
Gilpin1120242017
Burlington920242005
Sheridan Lak820161995
Lamar720242009
Neegrande620241995
Amherst520241993
Kirk520222004
Boyero420171994
Arsenal 2320242024
Waverly320191988
Villegreen320172015
Limon320242024
Gardner320242018
Blackhead Pk319951995
Bethune220231989
Campo220181999
Arsenal120152015
Fleming120241977
Last Chance120121998

Dickcissel Population Trend in Other States

alabamaarkansasdelawaregeorgiaillinoisindianaiowakansaskentuckylouisianamarylandmichiganminnesotamississippimissourimontananebraskanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasvirginiawest-virginiawisconsinwyoming

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