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Species · BCR 2 · BBS 2026 Release · 1966–2025

Boreal Chickadee In BCR 2

All regionsBCR 2Forest birds

Boreal Chickadee in BCR 2 has increased: up 37% on the route-weighted index since 1995.

+37%Since 1995TrendPercent 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 →
5Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
28YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Boreal Chickadee in BCR 2. See the full index history below.

Boreal Chickadee In BCR 2 Population Forecast

If the recent trend holds, Boreal Chickadee in BCR 2 is projected to fall about 34% by 2030 — from 0.67 in 2025 to a central estimate of 0.44 (95% range 0.09–0.78). A 5-year backtest shows a typical error of ±134.4%, with 60% of held-out values landing inside the 95% band.

-34%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 →
0.44Projected 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 →
0.09–0.7895% 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 →
±134.4%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, Boreal Chickadee in BCR 2 is projected to fall about 34% by 2030 — from 0.67 in 2025 to a central estimate of 0.44 (95% range 0.09–0.78). A 5-year backtest shows a typical error of ±134.4%, with 60% of held-out values landing inside the 95% band.19932030
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 →
20260.410.070.76
20270.420.070.76
20280.420.080.77
20290.430.090.78
20300.440.090.78

Routes In BCR 2

Routes recording Boreal Chickadee in BCR 2.
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 →
Katmai N.P.ALASKA32025
Gweek RiverALASKA22002
DillinghamALASKA12017
King SalmonALASKA12025
Togiak RiverALASKA12005

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