BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Spotted Towhee In Sierra Nevada

All regionsSierra NevadaGeneralists

Spotted Towhee in Sierra Nevada has surged: up 91% on the route-weighted index since 1970.

+91%Since 1970
39Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Spotted Towhee has surged in Sierra Nevada: up 91% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Spotted Towhee in Sierra Nevada is projected to rise about 21% by 2029 — from 15 in 2024 to a central estimate of 18 (95% range 13–23). A 5-year backtest shows a typical error of ±18.2%, with 80% of held-out values landing inside the 95% band.

+21%Change by 2029
18Projected 2029 index
13–2395% range
±18.2%Backtest error
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 index95% low95% high
2025181223
2026181323
2027181323
2028181323
2029181323

Routes In Sierra Nevada

Routes recording Spotted Towhee in Sierra Nevada.
CoultervilleCALIFORNIA472019
Forest HillCALIFORNIA342022
Bass LakeCALIFORNIA322019
Eagle LakeCALIFORNIA292024
Tahoe NfCALIFORNIA281994
JohnsvilleCALIFORNIA262024
Silver CityCALIFORNIA262013
KernvilleCALIFORNIA242008
Tuolumne GroveCALIFORNIA232024
Greenhorn MtCALIFORNIA222008
Higgins CornCALIFORNIA222024
WawonaCALIFORNIA222024
PlacervilleCALIFORNIA202024
Kings CanyonCALIFORNIA192024
ChilcootCALIFORNIA192024
GeneseeCALIFORNIA172024
DownievilleCALIFORNIA162024
WestvilleCALIFORNIA152024
PaxtonCALIFORNIA152024
Forest Hill 2CALIFORNIA152005
Cottage SpgsCALIFORNIA131975
LakeshoreCALIFORNIA132024
StrawberryCALIFORNIA122019
Hat CreekCALIFORNIA112018
RivertonCALIFORNIA102023

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