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

Dickcissel Population Trend in Maryland

All statesGrassland birds

Dickcissel in Maryland has surged: up 251% on the route-weighted index since 1970.

+251%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 →
18Routes 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 →
32YearsYears 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 MarylandNotable 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 Dickcissel in Maryland. See the full index history below.

Dickcissel Population Forecast in Maryland

If the recent trend holds, Dickcissel in Maryland is projected to fall about 20% by 2030 — from 0.16 in 2025 to a central estimate of 0.13 (95% range 0.03–0.23). A 5-year backtest shows a typical error of ±87.4%, with 100% of held-out values landing inside the 95% band.

-20%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 →
0.13Projected 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 →
0.03–0.2395% 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 →
±87.4%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 Maryland is projected to fall about 20% by 2030 — from 0.16 in 2025 to a central estimate of 0.13 (95% range 0.03–0.23). A 5-year backtest shows a typical error of ±87.4%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.120.020.22
20270.120.020.22
20280.120.020.22
20290.130.030.22
20300.130.030.23

Dickcissel Survey Routes in Maryland

Routes recording Dickcissel in Maryland.
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 →
Millington320051995
Emmitsburg320251970
Harmony319961994
Smithsburg220142010
Wolfsville220252011
Cokesbury219971997
Vindex120212021
Melitota120231987
Williamsport120251983
Silver Spg119801980
Piney Neck119891989
Matthews120211970
Easton119661966
Madison120002000
Vienna120112008
Randallstown119801980
Ijamsville120172011
Pomfret119671967

Dickcissel Population Trend in Other States

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

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