BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Brewer's Sparrow In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

Brewer's Sparrow in Southern Rockies / Colorado Plateau has surged: up 106% on the route-weighted index since 1970.

+106%Since 1970
182Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Brewer's Sparrow has surged in Southern Rockies / Colorado Plateau: up 106% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Brewer's Sparrow in Southern Rockies / Colorado Plateau is projected to rise about 20% by 2029 — from 5.8 in 2024 to a central estimate of 6.9 (95% range 2.6–11). A 5-year backtest shows a typical error of ±30%, with 100% of held-out values landing inside the 95% band.

+20%Change by 2029
6.9Projected 2029 index
2.6–1195% range
±30%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
20256.72.511
20266.82.511
20276.82.511
20286.92.611
20296.92.611

Routes In Southern Rockies / Colorado Plateau

Routes recording Brewer's Sparrow in Southern Rockies / Colorado Plateau.
WaldenCOLORADO802024
DinosaurCOLORADO692024
M Warner ResUTAH532024
Black Sulphur CrCOLORADO432024
BeckUTAH401987
AltonahUTAH402015
Wray GulchCOLORADO382023
AngoraCOLORADO352024
VernalUTAH352018
YampaCOLORADO342023
Lost Cr. ResUTAH342018
Fish Lake NfUTAH332024
Yellowjacket PassCOLORADO322024
BlandingUTAH312023
PiedraCOLORADO301999
Wilson CreekCOLORADO282024
Baxter PassCOLORADO282024
PowderhornCOLORADO272023
AntonitoCOLORADO272004
Moon Lake 2UTAH272023
Ant Flat-Ogden CanUTAH262023
Uintah NfUTAH251994
Piceance BasinCOLORADO222012
MoscaCOLORADO212024
Canyon RimsUTAH202024

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