BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Grasshopper Sparrow In Great Basin

All regionsGreat BasinGrassland birds

Grasshopper Sparrow in Great Basin has edged up: up 12% on the route-weighted index since 1971.

+12%Since 1971TrendPercent 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 →
104Routes 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 Grasshopper Sparrow in Great Basin. See the full index history below.

Grasshopper Sparrow In Great Basin Population Forecast

If the recent trend holds, Grasshopper Sparrow in Great Basin is projected to rise about 150% by 2029 — from 0.32 in 2024 to a central estimate of 0.80 (95% range 0.22–1.4). A 5-year backtest shows a typical error of ±225%, with 20% of held-out values landing inside the 95% band.

+150%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 →
0.80Projected 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 →
0.22–1.495% 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 →
±225%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, Grasshopper Sparrow in Great Basin is projected to rise about 150% by 2029 — from 0.32 in 2024 to a central estimate of 0.80 (95% range 0.22–1.4). A 5-year backtest shows a typical error of ±225%, with 20% 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 →
20250.780.201.4
20260.790.211.4
20270.790.211.4
20280.800.221.4
20290.800.221.4

Routes In Great Basin

Routes recording Grasshopper Sparrow in Great Basin.
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 →
HattonWASHINGTON291994
Arid Land ErWASHINGTON291996
EwanWASHINGTON162019
BickletonWASHINGTON122019
Lost RiverIDAHO102024
SpringfieldIDAHO91986
Blacks CreekIDAHO81969
Johnson CanUTAH72024
RichlandWASHINGTON72024
Twin ButtesIDAHO62024
HarringtonWASHINGTON62005
Hanford SiteWASHINGTON61996
WilburWASHINGTON52019
BlitzenOREGON41990
SquirrelIDAHO32024
Blackft ResIDAHO32008
PicaboIDAHO32021
Tractor FlatIDAHO32024
MinervaNEVADA32012
Notch PeakUTAH31992
SnowdenWASHINGTON31986
SulphurWASHINGTON32022
Crowley LakeCALIFORNIA21977
CedarvilleCALIFORNIA21982
BakerIDAHO22002

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