BirdAnalyst
Species · Utah · BBS 2025 Release · 1966–2024

Song Sparrow Population Trend in Utah

All statesGeneralists

Song Sparrow in Utah has fallen sharply: down 52% on the route-weighted index since 1970.

-52%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 →
81Routes 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Song Sparrow Trends in UtahNotable 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 declinecomputed 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 →

Song Sparrow has fallen sharply in Utah: down 52% on the route-weighted index since 1970.

Song Sparrow Population Forecast in Utah

If the recent trend holds, Song Sparrow in Utah is projected to stay roughly flat through 2029, near 1.1 (95% range 0.00–5.2). A 5-year backtest shows a typical error of ±30.8%, with 100% of held-out values landing inside the 95% band.

-8%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 →
1.1Projected 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 →
0.00–5.295% 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 →
±30.8%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 Utah is projected to stay roughly flat through 2029, near 1.1 (95% range 0.00–5.2). A 5-year backtest shows a typical error of ±30.8%, 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 →
20251.30.005.4
20261.30.005.4
20271.20.005.3
20281.20.005.3
20291.10.005.2

Song Sparrow Survey Routes in Utah

Routes recording Song Sparrow in Utah.
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 →
Hardware Ranch3220231994
Delta3020041990
Ant Flat-Ogden Can2020231994
Bear River1920231994
Hanna1720241997
Lost Cr. Res1720181995
Hyrum1519791975
Logan Canyon1120191997
Lynn1020231982
Castle Dale1020151993
Woodruff1020242002
Soapstone920221996
Dixie Nf920241993
Oak City719731973
Cleveland720011998
Wellington720011998
Uintah Nf619941987
Randolph620241994
Book Ridge620062003
Goshen520241968
Notom519941994
Newcastle520221997
Beck419871969
Hite420031992
Skyline Driv420161986

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseevermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.