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

Field Sparrow Population Trend in Wyoming

All statesForest birds

Field Sparrow in Wyoming has held roughly steady: up 5% on the route-weighted index since 1986.

+5%Since 1986TrendPercent 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 →
25Routes 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 →
35YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Field Sparrow 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 →

No notable trend signals for Field Sparrow in Wyoming. See the full index history below.

Field Sparrow Population Forecast in Wyoming

If the recent trend holds, Field Sparrow in Wyoming is projected to rise about 31% by 2030 — from 0.07 in 2025 to a central estimate of 0.10 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±92%, with 100% of held-out values landing inside the 95% band.

+31%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 →
0.10Projected 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 →
0.00–0.5295% 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 →
±92%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, Field Sparrow in Wyoming is projected to rise about 31% by 2030 — from 0.07 in 2025 to a central estimate of 0.10 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±92%, with 100% of held-out values landing inside the 95% band.19802030
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 →
20260.110.000.53
20270.110.000.53
20280.100.000.53
20290.100.000.52
20300.100.000.52

Field Sparrow Survey Routes in Wyoming

Routes recording Field Sparrow 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 →
Hampshire2619991994
Harmony1119871987
Soda Well520252006
Highlight419801980
Clark320072007
Shawnee320052000
Bill220011996
Pathfinder220171993
Otto120071990
Midvale119911991
Brookhurst120152015
Rozet120232023
Seely 2120182018
Arvada120241986
Recluse120251988
Piney119891980
Seely119901990
Ethete119931991
Harland Flat120251990
Riverview119891989
Raven120151992
Warbonnet119991997
Lusk119841984
Rawlins119931993
Cheyenne120051997

Field Sparrow Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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