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

Ring-billed Gull Population Trend in Wyoming

All statesWetland birds

Ring-billed Gull in Wyoming has surged: up 645% on the route-weighted index since 1979.

+645%Since 1979
28Routes In State
36Years

Notable Ring-billed Gull Trends in Wyoming

long arc increasecomputed index

Ring-billed Gull has surged in Wyoming: up 645% on the route-weighted index since 1979.

Ring-billed Gull Population Forecast in Wyoming

If the recent trend holds, Ring-billed Gull in Wyoming is projected to rise about 145% by 2029 — from 0.25 in 2024 to a central estimate of 0.61 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±549%, with 80% of held-out values landing inside the 95% band.

+145%Change by 2029
0.61Projected 2029 index
0.00–1.595% range
±549%Backtest error
19762029
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
20250.570.001.4
20260.580.001.5
20270.590.001.5
20280.600.001.5
20290.610.001.5

Ring-billed Gull Survey Routes in Wyoming

Routes recording Ring-billed Gull in Wyoming.
Midvale2920222017
Yoder2120041981
Rawlins1419991993
Harmony1220221987
Mtn View1019801980
Carter 2920212018
Green River919821977
Fontenelle820241982
Upton720242024
Cumberland519791979
Mckinnon519831976
Flamin Gorge320242024
Colter Bay219891989
Brookhurst220151997
Dwyer219941994
Sybille Cyn220242024
Otto120242024
Yellowstone120131989
Ervay120112011
Hunter Peak119941994
Alpine120241990
Ethete120221991
Fiddler Lk120012001
Sand Draw120192013
Caballa Crk120212021

Ring-billed Gull Population Trend in Other States

alabamaarizonacaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwest-virginiawisconsin

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