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

Blue Grosbeak Population Trend in Wyoming

All statesGeneralists

Blue Grosbeak in Wyoming has surged: up 149% on the route-weighted index since 1986.

+149%Since 1986TrendPercent 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 →
15Routes 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 →
38YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Blue Grosbeak 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 →

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 →

Blue Grosbeak has surged in Wyoming: up 149% on the route-weighted index since 1986.

Blue Grosbeak Population Forecast in Wyoming

If the recent trend holds, Blue Grosbeak in Wyoming is projected to fall about 48% by 2029 — from 0.23 in 2024 to a central estimate of 0.12 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±338%, with 60% of held-out values landing inside the 95% band.

-48%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 →
0.12Projected 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 →
0.00–0.2495% 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 →
±338%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, Blue Grosbeak in Wyoming is projected to fall about 48% by 2029 — from 0.23 in 2024 to a central estimate of 0.12 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±338%, with 60% of held-out values landing inside the 95% band.19792029
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 →
20250.120.000.23
20260.120.000.24
20270.120.000.24
20280.120.000.24
20290.120.000.24

Blue Grosbeak Survey Routes in Wyoming

Routes recording Blue Grosbeak 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 →
Lingle1120241987
Otto520241987
Dwyer419951994
Midvale320172017
Ethete220232022
Gebo220151993
Yoder220231986
Basin120241989
Tensleep120242022
Chugwater120242012
Pine Bluff120192019
Brookhurst119871979
Shawnee120222022
Mtn View120232023
Mayoworth120242024

Blue Grosbeak Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamarylandminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvirginiawest-virginia

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