BirdAnalyst
Species · BCR 34 · BBS 2026 Release · 1966–2025

Virginia's Warbler In Sierra Madre Occidental

All regionsSierra Madre OccidentalForest birds

Virginia's Warbler in Sierra Madre Occidental has increased: up 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 →
22Routes 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 →
55YearsYears 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 →

No notable trend signals for Virginia's Warbler in Sierra Madre Occidental. See the full index history below.

Virginia's Warbler In Sierra Madre Occidental Population Forecast

If the recent trend holds, Virginia's Warbler in Sierra Madre Occidental is projected to stay roughly flat through 2030, near 1.6 (95% range 0.00–7.4). A 5-year backtest shows a typical error of ±198.6%, with 100% of held-out values landing inside the 95% band.

-2%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 →
1.6Projected 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 →
0.00–7.495% 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 →
±198.6%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, Virginia's Warbler in Sierra Madre Occidental is projected to stay roughly flat through 2030, near 1.6 (95% range 0.00–7.4). A 5-year backtest shows a typical error of ±198.6%, 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 →
20261.90.007.7
20271.80.007.6
20281.70.007.5
20291.70.007.5
20301.60.007.4

Routes In Sierra Madre Occidental

Routes recording Virginia's Warbler in Sierra Madre Occidental.
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 →
PomereneARIZONA172004
PrescottARIZONA102025
Aztec PeakARIZONA101978
Tonto Vill.ARIZONA92025
Mt. GrahamARIZONA92025
Happy JackARIZONA82025
WilliamsARIZONA32025
Skull ValleyARIZONA32011
Vicks PeakNEW-MEXICO32008
BlueARIZONA21991
SunizonaARIZONA21996
PortalARIZONA22025
FlagstaffARIZONA11991
Mormon LakeARIZONA11975
MaineARIZONA11997
Forest LakesARIZONA12025
AlpineARIZONA12018
Carr MtnARIZONA12025
SprucedaleARIZONA12022
RuckerARIZONA11997
ReserveNEW-MEXICO12023
Emory PassNEW-MEXICO12025

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