BirdAnalyst
Species · BCR 16 · BBS 2026 Release · 1966–2025

Warbling Vireo In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauForest birds

Warbling Vireo in Southern Rockies / Colorado Plateau has surged: up 424% on the route-weighted index since 1970.

+424%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 →
169Routes In RegionSurvey 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 SignalsNotable 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 →

Warbling Vireo has surged in Southern Rockies / Colorado Plateau: up 424% on the route-weighted index since 1970.

Warbling Vireo In Southern Rockies / Colorado Plateau Population Forecast

If the recent trend holds, Warbling Vireo in Southern Rockies / Colorado Plateau is projected to rise about 21% by 2030 — from 12 in 2025 to a central estimate of 14 (95% range 11–18). A 5-year backtest shows a typical error of ±19.6%, with 100% of held-out values landing inside the 95% band.

+21%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 →
14Projected 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 →
11–1895% 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 →
±19.6%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, Warbling Vireo in Southern Rockies / Colorado Plateau is projected to rise about 21% by 2030 — from 12 in 2025 to a central estimate of 14 (95% range 11–18). A 5-year backtest shows a typical error of ±19.6%, 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 →
2026149.917
2027141017
2028141017
2029141018
2030141118

Routes In Southern Rockies / Colorado Plateau

Routes recording Warbling Vireo in Southern Rockies / Colorado Plateau.
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 →
Dolores RivCOLORADO842025
Dry ParkARIZONA812025
Dunckley PasCOLORADO592025
Mcphee Res.COLORADO462025
Owl Creek PassCOLORADO442025
FlattopsCOLORADO412025
Haycamp MesaCOLORADO402025
Uintah NfUTAH401994
BeckUTAH391987
Blackhead PkCOLORADO382025
Groundhog RsCOLORADO332025
Fox CreekCOLORADO322025
Baxter PassCOLORADO322024
VallecitosNEW-MEXICO322025
Grizzly RdgeUTAH322025
Fish Lake NfUTAH322025
AspenCOLORADO312025
ParlinCOLORADO312025
UncompahgreCOLORADO312025
Colona 2COLORADO312025
Lake City 2COLORADO312025
Stillwater PassCOLORADO312009
Rifle FallsCOLORADO302025
CebollaNEW-MEXICO302023
Skyline DrivUTAH302025

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