BirdAnalyst
Species · Maine · BBS 2026 Release · 1966–2025

Ruby-throated Hummingbird Population Trend in Maine

All statesForest birds

Ruby-throated Hummingbird in Maine has held roughly steady: down 9% on the route-weighted index since 1969.

-9%Since 1969TrendPercent 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 →
72Routes 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 Ruby-throated Hummingbird Trends in MaineNotable 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 Ruby-throated Hummingbird in Maine. See the full index history below.

Ruby-throated Hummingbird Population Forecast in Maine

If the recent trend holds, Ruby-throated Hummingbird in Maine is projected to fall about 28% by 2030 — from 0.67 in 2025 to a central estimate of 0.48 (95% range 0.15–0.81). A 5-year backtest shows a typical error of ±27.9%, with 100% of held-out values landing inside the 95% band.

-28%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 →
0.48Projected 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 →
0.15–0.8195% 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 →
±27.9%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 Maine is projected to fall about 28% by 2030 — from 0.67 in 2025 to a central estimate of 0.48 (95% range 0.15–0.81). A 5-year backtest shows a typical error of ±27.9%, with 100% 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 →
20260.470.140.80
20270.470.140.80
20280.480.150.80
20290.480.150.81
20300.480.150.81

Ruby-throated Hummingbird Survey Routes in Maine

Routes recording Ruby-throated Hummingbird in Maine.
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 →
Harmony320251972
Ludlow319961968
Big Twenty320071995
Andover320212010
Northfield 2220162015
Bethel220191997
Reeds220251983
East Troy220211984
Freedom220181979
Castine219921977
Carrying Pl220251996
Medway220182002
Pillsbury Pd219681968
St David220051993
Weeks Brook220032002
Yankeetuladi220091997
Topsfield219921978
Cape Neddick120232014
Westbrook120241982
Biddeford120161973
Kittery Pt120242004
Newcastle119991974
Wilson Mills120251983
Turner120021972
Greenwood120231972

Ruby-throated Hummingbird Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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