BirdAnalyst
Species · BCR 3 · BBS 2025 Release · 1966–2024

American Tree Sparrow In BCR 3

All regionsBCR 3Generalists

American Tree Sparrow in BCR 3 has surged: up 347% on the route-weighted index since 1996.

+347%Since 1996
4Routes In Region
30Years

Notable Signals

long arc increasecomputed index

American Tree Sparrow has surged in BCR 3: up 347% on the route-weighted index since 1996.

Forecast

If the recent trend holds, American Tree Sparrow in BCR 3 is projected to stay roughly flat through 2029, near 55 (95% range 33–77). A 5-year backtest shows a typical error of ±19.5%, with 100% of held-out values landing inside the 95% band.

-8%Change by 2029
55Projected 2029 index
33–7795% range
±19.5%Backtest error
19932029
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
2025512973
2026523074
2027533175
2028543276
2029553377

Routes In BCR 3

Routes recording American Tree Sparrow in BCR 3.
Happy ValleyALASKA1492024
Galbraith L.ALASKA742024
Red DogALASKA182024
Dietrich CmpALASKA12019

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