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

Indigo Bunting Population Trend in Michigan

All statesGeneralists

Indigo Bunting in Michigan has edged up: up 18% on the route-weighted index since 1968.

+18%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 →
107Routes 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 Indigo Bunting Trends in MichiganNotable 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 Indigo Bunting in Michigan. See the full index history below.

Indigo Bunting Population Forecast in Michigan

If the recent trend holds, Indigo Bunting in Michigan is projected to stay roughly flat through 2029, near 12 (95% range 7.2–17). A 5-year backtest shows a typical error of ±23.8%, with 100% of held-out values landing inside the 95% band.

+7%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 →
12Projected 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 →
7.2–1795% 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 →
±23.8%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, Indigo Bunting in Michigan is projected to stay roughly flat through 2029, near 12 (95% range 7.2–17). A 5-year backtest shows a typical error of ±23.8%, 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 →
2025127.117
2026127.217
2027127.217
2028127.217
2029127.217

Indigo Bunting Survey Routes in Michigan

Routes recording Indigo Bunting in Michigan.
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 →
Riggsville3320191967
Walloon Lake3320041977
Pleasant Valley 23120242004
Cunard3020211973
Hamburg2920011981
Galesburg2720241966
Almena2720151993
Nashville2520241968
Cedar Run2519991994
Bear Lake2320241967
Walloon Lake 22320242005
Hamburg 22220242004
Wilson2120101966
Fowlerville2120191974
Drayton Plns2119871973
Barry S.G.A.2120121995
Ontonagon2020191967
Herman2020221983
Skeels2020151966
Crystal Fls1920241980
Cohoctah1920242021
Howardsville1820241969
Mottville1820241967
Pickford1820241973
Bell Oak 21820232016

Indigo Bunting Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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