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Species · Arizona · BBS 2025 Release · 1966–2024

Ruby-crowned Kinglet Population Trend in Arizona

All statesForest birds

Ruby-crowned Kinglet in Arizona has surged: up 24× on the route-weighted index since 1975.

24×Since 1975
15Routes In State
49Years

Notable Ruby-crowned Kinglet Trends in Arizona

long arc increasecomputed index

Ruby-crowned Kinglet has surged in Arizona: up 24× on the route-weighted index since 1975.

Ruby-crowned Kinglet Population Forecast in Arizona

If the recent trend holds, Ruby-crowned Kinglet in Arizona is projected to rise about 201% by 2029 — from 0.71 in 2024 to a central estimate of 2.2 (95% range 0.98–3.3). A 5-year backtest shows a typical error of ±69.3%, with 80% of held-out values landing inside the 95% band.

+201%Change by 2029
2.2Projected 2029 index
0.98–3.395% range
±69.3%Backtest error
19682029
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
20252.00.833.2
20262.00.863.2
20272.10.903.3
20282.10.943.3
20292.20.983.3

Ruby-crowned Kinglet Survey Routes in Arizona

Routes recording Ruby-crowned Kinglet in Arizona.
Alpine3420231992
Dry Park2520241992
Tsaile2420231993
Maine919971994
Sprucedale820101992
Mt. Graham720231995
House Rock319971995
Blue319911974
Happy Jack220042002
Pinetop120182018
Portal119751975
Flagstaff120131990
Sawmill120141991
Mormon Lake119681968
Williams119931993

Ruby-crowned Kinglet Population Trend in Other States

alaskacaliforniacoloradoidahomainemichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkoregonsouth-dakotautahvermontwashingtonwisconsinwyoming

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