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

Field Sparrow Population Trend in Wyoming

All statesGeneralists

Field Sparrow in Wyoming has surged: up 118% on the route-weighted index since 1986.

+118%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 →
34YearsYears 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 →

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 →

Field Sparrow has surged in Wyoming: up 118% on the route-weighted index since 1986.

Field Sparrow Population Forecast in Wyoming

If the recent trend holds, Field Sparrow in Wyoming is projected to stay roughly flat through 2029, near 0.11 (95% range 0.00–0.54). A 5-year backtest shows a typical error of ±171.8%, with 100% of held-out values landing inside the 95% band.

+6%Change by 2029TrendPercent 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 →
0.11Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.5495% 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 →
±171.8%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 stay roughly flat through 2029, near 0.11 (95% range 0.00–0.54). A 5-year backtest shows a typical error of ±171.8%, with 100% of held-out values landing inside the 95% band.19802029
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 →
20250.120.000.55
20260.120.000.55
20270.110.000.54
20280.110.000.54
20290.110.000.54

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
Harland Flat1619901990
Recluse1420221988
Harmony1119871987
Soda Well820242006
Highlight419801980
Clark320072007
Shawnee320052000
Bill220011996
Pathfinder220171993
Otto120071990
Midvale119911991
Brookhurst120152015
Rozet120232023
Seely 2120182018
Arvada120241986
Piney119891980
Seely119901990
Ethete119931991
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 2026-05-22.