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Species · Wisconsin · BBS 2025 Release · 1966–2024

Marsh Wren Population Trend in Wisconsin

All statesForest birds

Marsh Wren in Wisconsin has declined: down 31% on the route-weighted index since 1968.

-31%Since 1968
54Routes In State
58Years

Notable Marsh Wren Trends in Wisconsin

No notable trend signals for Marsh Wren in Wisconsin. See the full index history below.

Marsh Wren Population Forecast in Wisconsin

If the recent trend holds, Marsh Wren in Wisconsin is projected to fall about 20% by 2029 — from 0.21 in 2024 to a central estimate of 0.17 (95% range 0.00–0.46). A 5-year backtest shows a typical error of ±56.1%, with 100% of held-out values landing inside the 95% band.

-20%Change by 2029
0.17Projected 2029 index
0.00–0.4695% range
±56.1%Backtest error
19662029
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
20250.180.000.48
20260.180.000.47
20270.170.000.47
20280.170.000.47
20290.170.000.46

Marsh Wren Survey Routes in Wisconsin

Routes recording Marsh Wren in Wisconsin.
Wis Rapids820231966
Iron River520241967
Bayfield519821982
Manitowoc420051975
Hatfield319951971
Hudson220151984
Cumberland219741974
Princeton219761970
Beaver Dam220231966
Buena Vista220232023
Briggsville220231999
Paris220241966
Chaffey119901990
Minong119941980
Shanagolden119861986
Montreal119851983
Dresser120231967
Loraine120051974
Weyerhauser119941994
Exeland120052004
Gilman120211981
Holway119701970
Omro 2120242004
Mcnaughton120182018
Esdaile119931969

Marsh Wren Population Trend in Other States

alabamaarizonacaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaslouisianamainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwyoming

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