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

Canada Warbler Population Trend in Wisconsin

All statesForest birds

Canada Warbler in Wisconsin has edged up: up 14% on the route-weighted index since 1968.

+14%Since 1968TrendPercent 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 →
45Routes 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 →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Canada Warbler Trends in WisconsinNotable 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 Canada Warbler in Wisconsin. See the full index history below.

Canada Warbler Population Forecast in Wisconsin

If the recent trend holds, Canada Warbler in Wisconsin is projected to rise about 41% by 2029 — from 0.15 in 2024 to a central estimate of 0.21 (95% range 0.02–0.40). A 5-year backtest shows a typical error of ±24.2%, with 100% of held-out values landing inside the 95% band.

+41%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 →
0.21Projected 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 →
0.02–0.4095% 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 →
±24.2%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, Canada Warbler in Wisconsin is projected to rise about 41% by 2029 — from 0.15 in 2024 to a central estimate of 0.21 (95% range 0.02–0.40). A 5-year backtest shows a typical error of ±24.2%, with 100% of held-out values landing inside the 95% band.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 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 →
20250.210.030.40
20260.210.030.40
20270.210.020.40
20280.210.020.40
20290.210.020.40

Canada Warbler Survey Routes in Wisconsin

Routes recording Canada Warbler in Wisconsin.
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 →
Mellen520241998
Minong220051967
Grand View220241971
Mcnaughton220141970
Popple River220231970
Gresham220041998
Grimms220102010
Chaffey120241969
Iron River120241985
Bayfield120241974
Shanagolden120231966
Montreal120211968
Land O Lakes120151970
Pigeon Creek120142014
Loraine119941975
Cumberland119931974
Couderay120191969
Exeland120091968
Holway119701970
Phillips120211979
Rib Lake120231966
Merrill119981972
Irma120181967
Eagle River120131966
Crandon119821974

Canada Warbler Population Trend in Other States

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

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