BirdAnalyst
Species · New Hampshire · BBS 2025 Release · 1966–2024

Indigo Bunting Population Trend in New Hampshire

All statesGeneralists

Indigo Bunting in New Hampshire has surged: up 192% on the route-weighted index since 1968.

+192%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 →
26Routes 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 New HampshireNotable 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 →

Indigo Bunting has surged in New Hampshire: up 192% on the route-weighted index since 1968.

Indigo Bunting Population Forecast in New Hampshire

If the recent trend holds, Indigo Bunting in New Hampshire is projected to rise about 26% by 2029 — from 4.0 in 2024 to a central estimate of 5.0 (95% range 3.5–6.6). A 5-year backtest shows a typical error of ±22.8%, with 100% of held-out values landing inside the 95% band.

+26%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 →
5.0Projected 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 →
3.5–6.695% 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 →
±22.8%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 New Hampshire is projected to rise about 26% by 2029 — from 4.0 in 2024 to a central estimate of 5.0 (95% range 3.5–6.6). A 5-year backtest shows a typical error of ±22.8%, 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 →
20254.83.36.3
20264.93.36.4
20274.93.46.5
20285.03.46.5
20295.03.56.6

Indigo Bunting Survey Routes in New Hampshire

Routes recording Indigo Bunting in New Hampshire.
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 →
Glen1720241975
Walpole820241966
Concord720241966
Canterbury720241966
Gilmantn I W620241970
Dixville Notch 2620242018
Fitzwilliam520241968
Epsom520211968
Marlow520241966
Lempster520241977
Jefferson Hl520241966
Wilmot320241970
Mt Chocorua320241966
Clarksville320231973
Peterborough220241966
Brentwood219981966
Strafford220241966
Franconia220241966
Dixvil Notch220161967
Jeffers Ntch220241994
Dover120231966
Hopkinton120241966
Crawford Not119751967
Milan120241966
Stratford120241966

Indigo Bunting Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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