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Species · Alaska · BBS 2025 Release · 1966–2024

American Tree Sparrow Population Trend in Alaska

All statesGeneralists

American Tree Sparrow in Alaska has surged: up 518% on the route-weighted index since 1977.

+518%Since 1977
73Routes In State
45Years

Notable American Tree Sparrow Trends in Alaska

long arc increasecomputed index

American Tree Sparrow has surged in Alaska: up 518% on the route-weighted index since 1977.

American Tree Sparrow Population Forecast in Alaska

If the recent trend holds, American Tree Sparrow in Alaska is projected to stay roughly flat through 2029, near 8.0 (95% range 1.2–15). A 5-year backtest shows a typical error of ±10.9%, with 100% of held-out values landing inside the 95% band.

+4%Change by 2029
8.0Projected 2029 index
1.2–1595% range
±10.9%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
20257.80.9815
20267.91.015
20277.91.115
20288.01.115
20298.01.215

American Tree Sparrow Survey Routes in Alaska

Routes recording American Tree Sparrow in Alaska.
Happy Valley14920241993
Savage11420241986
Toklat9420241982
Galbraith L.7420241995
Pinoche Tral (Short)4819841984
Maclaren4620241982
Gweek River3720021994
Nome3620231993
Togiak River2920051999
Kanektok Riv2420051995
Cantwell2220211982
Monahan2020211983
Red Dog1820241995
St. Mary'S1520141993
Kobuk River (Short)1319921991
Goodnews Bay1320051999
Dillingham1120121993
Circle1020181992
Salmon Lake1020191993
Porcupine R.1019941994
Kugarak (Short)919871986
Tupuknuk819951995
Chatanika R620151968
Paxson Lake619971991
Manley Ht Sp620221993

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