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Species · Wisconsin · BBS 2025 Release · 1966–2024

Blackburnian Warbler Population Trend in Wisconsin

All statesForest birds

Blackburnian Warbler in Wisconsin has surged: up 168% on the route-weighted index since 1968.

+168%Since 1968
38Routes In State
58Years

Notable Blackburnian Warbler Trends in Wisconsin

long arc increasecomputed index

Blackburnian Warbler has surged in Wisconsin: up 168% on the route-weighted index since 1968.

Blackburnian Warbler Population Forecast in Wisconsin

If the recent trend holds, Blackburnian Warbler in Wisconsin is projected to stay roughly flat through 2029, near 0.92 (95% range 0.53–1.3). A 5-year backtest shows a typical error of ±29.6%, with 60% of held-out values landing inside the 95% band.

+4%Change by 2029
0.92Projected 2029 index
0.53–1.395% range
±29.6%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
20250.880.491.3
20260.890.501.3
20270.900.511.3
20280.910.521.3
20290.920.531.3

Blackburnian Warbler Survey Routes in Wisconsin

Routes recording Blackburnian Warbler in Wisconsin.
Land O Lakes1020161967
Eagle River1020241966
Cavour920241998
Popple River820241967
Mellen620241998
Land O' Lakes 2620242017
Pigeon Creek520192007
Grand View420241966
Shanagolden420241966
Rib Lake420241970
Mcnaughton420241967
Gresham420241999
Wausaukee320221981
Washington I320241967
Iron River220241967
Montreal220241975
Exeland220231969
Phillips220151970
Crandon220241967
Weirgor Springs220232011
Flambeau220231998
Chaffey120211966
Minong120191974
Bayfield120241973
Union Twp120131975

Blackburnian Warbler Population Trend in Other States

connecticutgeorgiaindianamainemarylandmassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinaohiopennsylvaniarhode-islandtennesseevermontvirginiawest-virginia

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