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

Savannah Sparrow Population Trend in Wyoming

All statesGrassland birds

Savannah Sparrow in Wyoming has surged: up 509% on the route-weighted index since 1970.

+509%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 →
102Routes 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 →
53YearsYears 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 509% 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 41% by 2029 — from 3.1 in 2024 to a central estimate of 4.3 (95% range 2.1–6.6). A 5-year backtest shows a typical error of ±22%, with 100% of held-out values landing inside the 95% band.

+41%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 →
4.3Projected 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 →
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 →
±22%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 41% by 2029 — from 3.1 in 2024 to a central estimate of 4.3 (95% range 2.1–6.6). A 5-year backtest shows a typical error of ±22%, 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 →
20254.22.06.4
20264.22.06.4
20274.32.06.5
20284.32.16.5
20294.32.16.6

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 →
Boulder4320241982
Yellowstone3620221987
Hayden Val3519861985
Shawnee3320021998
Riverside2320241990
Mtn View2320241980
Harmony1920231982
Big Sandy1820241983
Ne Entrance1620211982
Cody1620241983
Seedskadee 21620242024
Midvale1320241987
Fontenelle1220241982
Patrick Draw1019801978
Clarkelen819771974
Mammoth820241982
Meeteetse820241997
Bald Mtn820241992
Recluse820231987
Soda Well820241982
Moose720241976
Seedskadee720231986
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 2026-05-22.