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

Great Blue Heron Population Trend in Wyoming

All statesWetland birds

Great Blue Heron in Wyoming has increased: up 39% on the route-weighted index since 1974.

+39%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 →
88Routes 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 →
51YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Great Blue Heron Trends in WyomingNotable 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 Great Blue Heron in Wyoming. See the full index history below.

Great Blue Heron Population Forecast in Wyoming

If the recent trend holds, Great Blue Heron in Wyoming is projected to fall about 78% by 2029 — from 0.26 in 2024 to a central estimate of 0.06 (95% range 0.00–1.8). A 5-year backtest shows a typical error of ±27.1%, with 100% of held-out values landing inside the 95% band.

-78%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 →
0.06Projected 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 →
0.00–1.895% 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 →
±27.1%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, Great Blue Heron in Wyoming is projected to fall about 78% by 2029 — from 0.26 in 2024 to a central estimate of 0.06 (95% range 0.00–1.8). A 5-year backtest shows a typical error of ±27.1%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.160.001.9
20260.140.001.9
20270.110.001.9
20280.080.001.8
20290.060.001.8

Great Blue Heron Survey Routes in Wyoming

Routes recording Great Blue Heron in Wyoming.
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 →
Green River1319841977
Lusk720001999
Wyarno620171990
Daniel619881980
Yellowstone620221987
Cody520241983
Basin520171972
Seely520001992
Otto420081974
Big Sandy420081990
Soda Well320191987
Anchor320162016
Rawlins320051989
Moran320162002
Ne Entrance219891988
Colter Bay219981994
Brookhurst220171968
Dwyer220161995
Cumberland220191988
Crazy Woman220142010
Arvada220161982
Recluse220161988
Alpine220241979
Mayoworth220181982
Newcastle220242021

Great Blue Heron Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

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