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

Dickcissel Population Trend in Colorado

All statesGrassland birds

Dickcissel in Colorado has surged: up 896% on the route-weighted index since 1974.

+896%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 →
46Routes 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 →
47YearsYears 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 896% 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 55% by 2030 — from 2.4 in 2025 to a central estimate of 1.1 (95% range 0.29–1.9). A 5-year backtest shows a typical error of ±59%, with 80% of held-out values landing inside the 95% band.

-55%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 →
1.1Projected 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 →
0.29–1.995% 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 →
±59%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 55% by 2030 — from 2.4 in 2025 to a central estimate of 1.1 (95% range 0.29–1.9). A 5-year backtest shows a typical error of ±59%, with 80% of held-out values landing inside the 95% band.19692030
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 →
20261.00.201.8
20271.00.221.8
20281.10.251.9
20291.10.271.9
20301.10.291.9

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 →
Pritchett5320251995
Gilpin3620252017
Edler2820252001
Campo2520251999
Neegrande2420251995
Two Buttes2120251977
Pinneo1920181983
Fort Morgan1620251999
Julesburg1420211998
Haswell1320241994
Rush1220252025
Cheyenne1020251990
Flagler1020252005
Burlington920242005
Sheridan Lak820161995
Lamar720242009
Ludlow720252025
Gardner620252018
Amherst520241993
Kirk520222004
Last Chance 2520252025
Boyero420171994
Timpas420252025
Arsenal 2320242024
Waverly320191988

Dickcissel Population Trend in Other States

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

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