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

Common Poorwill Population Trend in Wyoming

All statesAerial insectivores

Common Poorwill in Wyoming has fallen sharply: down 55% on the route-weighted index since 1976.

-55%Since 1976TrendPercent 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 →
36Routes 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 →
44YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Poorwill 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 declinecomputed 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 →

Common Poorwill has fallen sharply in Wyoming: down 55% on the route-weighted index since 1976.

Common Poorwill Population Forecast in Wyoming

If the recent trend holds, Common Poorwill in Wyoming is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±79.7%, with 80% of held-out values landing inside the 95% band.

n/aChange 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 →
0.03Projected 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 →
0.00–0.1395% 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 →
±79.7%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, Common Poorwill in Wyoming is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±79.7%, with 80% of held-out values landing inside the 95% band.19722029
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 →
20250.030.000.14
20260.030.000.13
20270.030.000.13
20280.030.000.13
20290.030.000.13

Common Poorwill Survey Routes in Wyoming

Routes recording Common Poorwill 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 →
Teapot Dome819831982
Meeteetse320192014
Black Rock 2320232023
Prior Flats220062004
Natrona219901973
Sweetwater220092007
Fletcher Pk220151984
Mtn View219821981
Dubois120152015
Nowood120032003
Fontenelle119871987
Bear Creek120242023
Ervay120242011
Cumberland120171993
Mckinnon119861972
Buford120232017
Moose119811981
Tensleep120152015
Dayton119831983
Arvada120242024
Gebo120161996
Mayoworth120061983
Seedskadee120162016
Rawlins 2120232023
Sand Draw120152014

Common Poorwill Population Trend in Other States

arizonacaliforniacoloradoidahokansasmontananebraskanevadanew-mexicooklahomaoregonsouth-dakotatexasutahwashington

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