BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Bobolink Population Trend in Wyoming

All statesGrassland birds

Bobolink in Wyoming has surged: up 224% on the route-weighted index since 1977.

+224%Since 1977TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
23Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
46YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bobolink Trends in WyomingNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Bobolink has surged in Wyoming: up 224% on the route-weighted index since 1977.

Bobolink Population Forecast in Wyoming

If the recent trend holds, Bobolink in Wyoming is projected to fall about 21% by 2030 — from 0.40 in 2025 to a central estimate of 0.32 (95% range 0.00–0.93). A 5-year backtest shows a typical error of ±58.5%, with 100% of held-out values landing inside the 95% band.

-21%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.32Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.9395% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±58.5%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Bobolink in Wyoming is projected to fall about 21% by 2030 — from 0.40 in 2025 to a central estimate of 0.32 (95% range 0.00–0.93). A 5-year backtest shows a typical error of ±58.5%, with 100% of held-out values landing inside the 95% band.19742030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20260.320.000.93
20270.320.000.93
20280.320.000.93
20290.320.000.93
20300.320.000.93

Bobolink Survey Routes in Wyoming

Routes recording Bobolink in Wyoming.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Gvnt Valley1420252001
Dayton1420251980
Tensleep520252022
Midvale319751975
Cody220251991
Seely 2220242002
Hampshire220242015
Moskee 2220172012
Wyarno119751975
Clarkelen119741974
Sundance120251977
Nowood120052005
Clark120252025
Lovell120162016
Meeteetse120031998
Thunder Basin120242024
Seely119951995
Moskee119921988
Mayoworth120182018
Sussex120252024
Pathfinder119911991
Moskee 3120232023
Walcott119911991

Bobolink Population Trend in Other States

californiacoloradoconnecticutidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotautahvermontvirginiawashingtonwest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.