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

Trumpeter Swan Population Trend in Wisconsin

All statesWaterfowl

Trumpeter Swan in Wisconsin has surged: up 675% on the route-weighted index since 1995.

+675%Since 1995
26Routes In State
22Years

Notable Trumpeter Swan Trends in Wisconsin

long arc increasecomputed index

Trumpeter Swan has surged in Wisconsin: up 675% on the route-weighted index since 1995.

Trumpeter Swan Population Forecast in Wisconsin

If the recent trend holds, Trumpeter Swan in Wisconsin is projected to fall about 41% by 2029 — from 0.62 in 2024 to a central estimate of 0.36 (95% range 0.13–0.60). A 5-year backtest shows a typical error of ±315.8%, with 20% of held-out values landing inside the 95% band.

-41%Change by 2029
0.36Projected 2029 index
0.13–0.6095% range
±315.8%Backtest error
19932029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.320.080.55
20260.330.100.56
20270.340.100.57
20280.350.120.59
20290.360.130.60

Trumpeter Swan Survey Routes in Wisconsin

Routes recording Trumpeter Swan in Wisconsin.
Bashaw1520242021
Loraine1420211995
Hudson1320242007
Brownsville820222022
Dresser720242012
Cavour520222022
Mather420231994
Buena Vista420242024
Minong320032003
Gilman320242013
Flambeau320172013
Grand View220242014
Shanagolden220212009
Cumberland220242011
Weyerhauser220232023
Princeton220242024
N Andover220222022
Land O Lakes120142011
Union Twp120232007
Couderay120152015
Pigeon Creek120242022
Cochrane120222022
Unity120172017
Manawa119931993
Conover120232023

Trumpeter Swan Population Trend in Other States

alaskaarkansasidahoiowamichiganminnesotamontananebraskanevadanorth-dakotaohiooregonsouth-dakotautahwashingtonwyoming

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