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Species · Wyoming · BBS 2025 Release · 1966–2024

Cliff Swallow Population Trend in Wyoming

All statesAerial insectivores

Cliff Swallow in Wyoming has declined: down 27% on the route-weighted index since 1970.

-27%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 →
124Routes 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 →
56YearsYears 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 2029, near 20 (95% range 5.0–36). A 5-year backtest shows a typical error of ±23.2%, with 100% of held-out values landing inside the 95% band.

+10%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 →
20Projected 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 →
5.0–3695% 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 →
±23.2%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 2029, near 20 (95% range 5.0–36). A 5-year backtest shows a typical error of ±23.2%, with 100% of held-out values landing inside the 95% band.19682029
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 →
2025215.336
2026215.236
2027205.136
2028205.036
2029205.036

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 →
Bill18820181974
Yoder17320241970
Natrona16019921968
Dwyer15520191992
Arvada15220241982
Sussex11820241991
Meeteetse11720241991
Pine Tree10919951980
Seely 210620242001
Lingle10420241980
Harmony10420231980
Boulder10020241982
Colter Bay9519991968
Moran8020162002
Hayden Val7619861985
Piney7419901980
Seely5820001991
Mtn View5320241981
Cody5120241983
Shirley5020241980
Gebo4720241980
Kaycee4620242014
Schoonover4520241982
Riverview4120221984
Basin4020241970

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 2026-05-22.