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

Song Sparrow In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauForest birds

Song Sparrow in Southern Rockies / Colorado Plateau has held roughly steady: up 9% on the route-weighted index since 1970.

+9%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 →
172Routes 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 →

No notable trend signals for Song Sparrow in Southern Rockies / Colorado Plateau. See the full index history below.

Song Sparrow In Southern Rockies / Colorado Plateau Population Forecast

If the recent trend holds, Song Sparrow in Southern Rockies / Colorado Plateau is projected to fall about 18% by 2030 — from 3.6 in 2025 to a central estimate of 3.0 (95% range 1.7–4.3). A 5-year backtest shows a typical error of ±8.2%, with 100% of held-out values landing inside the 95% band.

-18%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 →
3.0Projected 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 →
1.7–4.395% 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 →
±8.2%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, Song Sparrow in Southern Rockies / Colorado Plateau is projected to fall about 18% by 2030 — from 3.6 in 2025 to a central estimate of 3.0 (95% range 1.7–4.3). A 5-year backtest shows a typical error of ±8.2%, 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 →
20263.01.74.3
20273.01.74.3
20283.01.74.3
20293.01.74.3
20303.01.74.3

Routes In Southern Rockies / Colorado Plateau

Routes recording Song Sparrow 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 →
YampaCOLORADO432023
Rifle FallsCOLORADO342025
AspenCOLORADO282025
Ragged Mtn.COLORADO272025
Ant Flat-Ogden CanUTAH262025
Stillwater Pass 2COLORADO222025
CastletonCOLORADO202025
Yellowjacket PassCOLORADO192025
BufordCOLORADO182025
HeeneyCOLORADO182019
ParlinCOLORADO172025
Moon PassCOLORADO172025
HannaUTAH172024
Lost Cr. ResUTAH172018
Ojo SarcoNEW-MEXICO132025
DoylevilleCOLORADO122025
AlamosaCOLORADO122025
Wilson CreekCOLORADO112025
Red CliffCOLORADO112025
Dixie NfUTAH112025
Logan CanyonUTAH112019
Lizard Head PassCOLORADO102025
Heeney 2COLORADO102025
Castle DaleUTAH102015
WarbonnetWYOMING102025

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