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Species · Maine · BBS 2025 Release · 1966–2024

Ruby-crowned Kinglet Population Trend in Maine

All statesForest birds

Ruby-crowned Kinglet in Maine has collapsed: down 89% on the route-weighted index since 1968.

-89%Since 1968
63Routes In State
58Years

Notable Ruby-crowned Kinglet Trends in Maine

long arc declinecomputed index

Ruby-crowned Kinglet has collapsed in Maine: down 89% on the route-weighted index since 1968.

Ruby-crowned Kinglet Population Forecast in Maine

If the recent trend holds, Ruby-crowned Kinglet in Maine is projected to rise about 232% by 2029 — from 0.05 in 2024 to a central estimate of 0.18 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±130.2%, with 100% of held-out values landing inside the 95% band.

+232%Change by 2029
0.18Projected 2029 index
0.00–1.695% range
±130.2%Backtest error
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 index95% low95% high
20250.280.001.7
20260.250.001.6
20270.230.001.6
20280.200.001.6
20290.180.001.6

Ruby-crowned Kinglet Survey Routes in Maine

Routes recording Ruby-crowned Kinglet in Maine.
Big Twenty1720081993
Pillsbury Pd1119681968
Big Twenty 2920092009
Yankeetuladi920091994
Moose River520081983
Weeks Brook520161995
Lake Moxie520102008
Northfield 2319981992
Otisfield Gr319751975
Bowdoin Ctr319751975
Harmony319961972
Benton319801977
Northfield319811976
Seboomook Lk320141978
St David320051982
Bethel219771977
Nesowadnehun220211991
Greenwood220052005
South Arm219991977
Hermon219921974
Hancock219871969
Aurora219981975
Grnd Lk Strm219991966
Waite219771977
Baker Lake 2220112011

Ruby-crowned Kinglet Population Trend in Other States

alaskaarizonacaliforniacoloradoidahomichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkoregonsouth-dakotautahvermontwashingtonwisconsinwyoming

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