BirdAnalyst
Species · BCR 18 · BBS 2025 Release · 1966–2024

Savannah Sparrow In Shortgrass Prairie

All regionsShortgrass PrairieGrassland birds

Savannah Sparrow in Shortgrass Prairie has collapsed: down 88% on the route-weighted index since 1980.

-88%Since 1980TrendPercent 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 →
25Routes 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 →
34YearsYears 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 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 →

Savannah Sparrow has collapsed in Shortgrass Prairie: down 88% on the route-weighted index since 1980.

Savannah Sparrow In Shortgrass Prairie Population Forecast

If the recent trend holds, Savannah Sparrow in Shortgrass Prairie is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–0.26). A 5-year backtest shows a typical error of ±151.7%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.03Projected 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 →
0.00–0.2695% 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 →
±151.7%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, Savannah Sparrow in Shortgrass Prairie is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–0.26). A 5-year backtest shows a typical error of ±151.7%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.040.000.27
20260.030.000.26
20270.030.000.26
20280.030.000.26
20290.030.000.26

Routes In Shortgrass Prairie

Routes recording Savannah Sparrow in Shortgrass Prairie.
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 →
AbarrCOLORADO81969
Adams Co.COLORADO52019
Wildhorse LCOLORADO42000
Pine BluffWYOMING31999
GilpinCOLORADO22016
HudsonCOLORADO22000
VillegreenCOLORADO22000
RosebudNEW-MEXICO22003
MaxwellNEW-MEXICO22003
BriggsdaleCOLORADO12024
RushCOLORADO12017
BethuneCOLORADO12023
GroverCOLORADO12011
LimonCOLORADO12015
KirkCOLORADO12022
NeegrandeCOLORADO12003
JulesburgCOLORADO12009
PritchettCOLORADO12016
ElbertCOLORADO12005
DaltonNEBRASKA11977
BereaNEBRASKA11980
FloydNEW-MEXICO12011
SedanNEW-MEXICO11999
YoderWYOMING12024
CheyenneWYOMING12021

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