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

Ruby-throated Hummingbird Population Trend in Maine

All statesGeneralists

Ruby-throated Hummingbird in Maine has edged down: down 15% on the route-weighted index since 1969.

-15%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 →
57YearsYears 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 rise about 24% by 2029 — from 0.37 in 2024 to a central estimate of 0.46 (95% range 0.13–0.78). A 5-year backtest shows a typical error of ±32.5%, with 80% of held-out values landing inside the 95% band.

+24%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 →
0.46Projected 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 →
0.13–0.7895% 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 →
±32.5%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 rise about 24% by 2029 — from 0.37 in 2024 to a central estimate of 0.46 (95% range 0.13–0.78). A 5-year backtest shows a typical error of ±32.5%, with 80% 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 →
20250.450.130.78
20260.450.130.78
20270.450.130.78
20280.460.130.78
20290.460.130.78

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 →
Reeds320231983
Ludlow319961968
Big Twenty320071995
Andover320212010
Northfield 2220162015
Bethel220191997
East Troy220191984
Freedom220181979
Harmony220241972
Brooks220141977
Eastbrook220221974
Castine219921977
Medway220182002
Pillsbury Pd219681968
St David220051993
Weeks Brook220032002
Yankeetuladi220091997
Topsfield219921978
Cape Neddick120232014
Westbrook120241982
Biddeford120161973
Kittery Pt120242004
Newcastle119991974
Wilson Mills120241983
Turner120021972

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 2026-05-22.