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

Trumpeter Swan Population Trend in Wyoming

All statesWaterfowl

Trumpeter Swan in Wyoming has surged: up 386% on the route-weighted index since 1992.

+386%Since 1992TrendPercent 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 →
13Routes 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 →
33YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Trumpeter Swan 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 Trumpeter Swan in Wyoming. See the full index history below.

Trumpeter Swan Population Forecast in Wyoming

If the recent trend holds, Trumpeter Swan in Wyoming is projected to rise about 135% by 2030 — from 0.10 in 2025 to a central estimate of 0.23 (95% range 0.08–0.38). A 5-year backtest shows a typical error of ±42.7%, with 100% of held-out values landing inside the 95% band.

+135%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 →
0.23Projected 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 →
0.08–0.3895% 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 →
±42.7%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, Trumpeter Swan in Wyoming is projected to rise about 135% by 2030 — from 0.10 in 2025 to a central estimate of 0.23 (95% range 0.08–0.38). A 5-year backtest shows a typical error of ±42.7%, with 100% of held-out values landing inside the 95% band.19882030
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 →
20260.200.050.35
20270.210.060.36
20280.210.060.37
20290.220.070.37
20300.230.080.38

Trumpeter Swan Survey Routes in Wyoming

Routes recording Trumpeter Swan 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 →
Fontenelle520252011
Seedskadee220161997
Seedskadee 2220242024
Ryegrass220162016
Alpine219981995
Mtn View220252024
Mammoth220252004
Hunter Peak120022002
Ne Entrance120181988
Moose120211998
Yellowstone120211988
Boulder120231998
Moran120162016

Trumpeter Swan Population Trend in Other States

alaskaarkansasidahoiowamichiganminnesotamontananebraskanevadanorth-dakotaohiooregonsouth-dakotautahwashingtonwisconsin

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