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

Cliff Swallow Population Trend in Wyoming

All statesAerial insectivores

Cliff Swallow in Wyoming has edged down: down 25% on the route-weighted index since 1970.

-25%Since 1970TrendPercent 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 →
125Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Cliff Swallow 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 Cliff Swallow in Wyoming. See the full index history below.

Cliff Swallow Population Forecast in Wyoming

If the recent trend holds, Cliff Swallow in Wyoming is projected to stay roughly flat through 2030, near 21 (95% range 5.3–36). A 5-year backtest shows a typical error of ±12.6%, with 100% of held-out values landing inside the 95% band.

-6%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 →
21Projected 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 →
5.3–3695% 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 →
±12.6%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, Cliff Swallow in Wyoming is projected to stay roughly flat through 2030, near 21 (95% range 5.3–36). A 5-year backtest shows a typical error of ±12.6%, with 100% of held-out values landing inside the 95% band.19682030
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 →
2026215.736
2027215.636
2028215.536
2029215.436
2030215.336

Cliff Swallow Survey Routes in Wyoming

Routes recording Cliff Swallow 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 →
Kaycee19920252014
Bill18820181974
Natrona16019921968
Ne Entrance15220251982
Rozet12820251991
Sussex11620251991
Yellowstone11520251987
Pine Tree10919951980
Shirley10520251980
Lingle10420241980
Gebo9820251980
Colter Bay9519991968
Riverside9420251968
Yoder8920251970
Meeteetse8320251991
Boulder8020251982
Moran8020162002
Hayden Val7619861985
Piney7419901980
Walcott6520251982
Seely5820001991
Arvada5720251982
Mtn View5320241981
Dwyer4820251992
Cody4720251983

Cliff Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

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