BirdAnalyst
Species · California · BBS 2025 Release · 1966–2024

Green-winged Teal Population Trend in California

All statesWaterfowl

Green-winged Teal in California has surged: up 235% on the route-weighted index since 1976.

+235%Since 1976
21Routes In State
40Years

Notable Green-winged Teal Trends in California

long arc increasecomputed index

Green-winged Teal has surged in California: up 235% on the route-weighted index since 1976.

Green-winged Teal Population Forecast in California

If the recent trend holds, Green-winged Teal in California is projected to fall about 37% by 2029 — from 0.07 in 2024 to a central estimate of 0.04 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±57.5%, with 60% of held-out values landing inside the 95% band.

-37%Change by 2029
0.04Projected 2029 index
0.00–0.0895% range
±57.5%Backtest error
19722029
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
20250.040.000.08
20260.040.000.08
20270.040.000.08
20280.040.000.08
20290.040.000.08

Green-winged Teal Survey Routes in California

Routes recording Green-winged Teal in California.
Carrizo Pln1019781978
Chilcoot520242024
Last Chance520192011
Sattley419721972
Yreka320071986
Riovista219761976
Dorris220171974
Macdoel220112008
Clear Lk Res220041986
Ravendale220071996
Lake Hemet219811981
Crescent Cty119881988
Crowder Flat120032003
Likely120132011
Madeline120192012
Crowley Lake120132013
Honey Lake119991999
Cedarville120032003
Coyote119831983
Ingalls119771977
Benton120242015

Green-winged Teal Population Trend in Other States

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