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Species · Wisconsin · BBS 2026 Release · 1966–2025

Ruby-throated Hummingbird Population Trend in Wisconsin

All statesForest birds

Ruby-throated Hummingbird in Wisconsin has surged: up 257% on the route-weighted index since 1968.

+257%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 →
97Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ruby-throated Hummingbird 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Ruby-throated Hummingbird has surged in Wisconsin: up 257% on the route-weighted index since 1968.

Ruby-throated Hummingbird Population Forecast in Wisconsin

If the recent trend holds, Ruby-throated Hummingbird in Wisconsin is projected to rise about 74% by 2030 — from 0.56 in 2025 to a central estimate of 0.97 (95% range 0.69–1.2). A 5-year backtest shows a typical error of ±39.1%, with 60% of held-out values landing inside the 95% band.

+74%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 →
0.97Projected 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 →
0.69–1.295% 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 →
±39.1%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, Ruby-throated Hummingbird in Wisconsin is projected to rise about 74% by 2030 — from 0.56 in 2025 to a central estimate of 0.97 (95% range 0.69–1.2). A 5-year backtest shows a typical error of ±39.1%, with 60% of held-out values landing inside the 95% band.19662030
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 →
20260.920.641.2
20270.930.661.2
20280.940.671.2
20290.960.681.2
20300.970.691.2

Ruby-throated Hummingbird Survey Routes in Wisconsin

Routes recording Ruby-throated Hummingbird 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 →
Phillips620241966
Mather620231966
Rib Lake520251973
Hollister420191970
Iron River320241973
Couderay320191976
Exeland320221968
Holway319881968
Wausaukee320251983
Esdaile320251968
Gilmanton320251970
Cadott320241968
Newburg Crns320181975
Mellen320252002
Chaffey220211980
Minong220231970
Hudson220112003
Union Twp220251978
Gilman220251973
Irma220241969
Crandon220251967
Washington I220251967
Omro220011970
Viroqua220241979
New Lisbon220241967

Ruby-throated Hummingbird Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginia

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