BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Savannah Sparrow Population Trend in Wyoming

All statesGrassland birds

Savannah Sparrow in Wyoming has surged: up 520% on the route-weighted index since 1970.

+520%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 →
104Routes 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 Savannah Sparrow Trends in WyomingNotable 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 increasecomputed 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 surged in Wyoming: up 520% on the route-weighted index since 1970.

Savannah Sparrow Population Forecast in Wyoming

If the recent trend holds, Savannah Sparrow in Wyoming is projected to rise about 73% by 2030 — from 2.5 in 2025 to a central estimate of 4.3 (95% range 2.1–6.6). A 5-year backtest shows a typical error of ±25.8%, with 100% of held-out values landing inside the 95% band.

+73%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 →
4.3Projected 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 →
2.1–6.695% 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 →
±25.8%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, Savannah Sparrow in Wyoming is projected to rise about 73% by 2030 — from 2.5 in 2025 to a central estimate of 4.3 (95% range 2.1–6.6). A 5-year backtest shows a typical error of ±25.8%, 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 →
20264.21.96.4
20274.22.06.4
20284.32.06.5
20294.32.16.5
20304.32.16.6

Savannah Sparrow Survey Routes in Wyoming

Routes recording Savannah Sparrow in Wyoming.
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 →
Hayden Val3519861985
Shawnee3320021998
Boulder3220251982
Yellowstone2920251987
Mtn View2320241980
Big Sandy1620251983
Seedskadee 21620242024
Ne Entrance1420251982
Cody1420251983
Fontenelle1220251982
Riverside1120251990
Walcott1120251989
Harmony1120251982
Patrick Draw1019801978
Mammoth1020251982
Moose920251976
Clarkelen819771974
Recluse820231987
Soda Well820241982
Bald Mtn720251992
Seedskadee720231986
Meeteetse620251997
Crazy Woman620241979
Riverview619881984
Diamondville619801977

Savannah Sparrow Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsin

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