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

Bobolink Population Trend in Washington

All statesGrassland birds

Bobolink in Washington has edged up: up 11% on the route-weighted index since 1990.

+11%Since 1990
6Routes In State
25Years

Notable Bobolink Trends in Washington

No notable trend signals for Bobolink in Washington. See the full index history below.

Bobolink Population Forecast in Washington

If the recent trend holds, Bobolink in Washington is projected to stay roughly flat through 2028, near 0.08 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±102.2%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028
0.08Projected 2028 index
0.00–0.1995% range
±102.2%Backtest error
19782028
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
20240.070.000.19
20250.070.000.19
20260.080.000.19
20270.080.000.19
20280.080.000.19

Bobolink Survey Routes in Washington

Routes recording Bobolink in Washington.
Nighthawk920161993
Laurier319951995
Cusick120232016
Omak Creek119981998
Chewelah119941978
Tonasket120131991

Bobolink Population Trend in Other States

californiacoloradoconnecticutidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotautahvermontvirginiawest-virginiawisconsinwyoming

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