BirdAnalyst
Species · BCR 18 · BBS 2025 Release · 1966–2024

Brewer's Sparrow In Shortgrass Prairie

All regionsShortgrass PrairieGeneralists

Brewer's Sparrow in Shortgrass Prairie has fallen sharply: down 72% on the route-weighted index since 1969.

-72%Since 1969
45Routes In Region
57Years

Notable Signals

long arc declinecomputed index

Brewer's Sparrow has fallen sharply in Shortgrass Prairie: down 71% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Brewer's Sparrow in Shortgrass Prairie is projected to fall about 12% by 2029 — from 0.39 in 2024 to a central estimate of 0.34 (95% range 0.00–1.4). A 5-year backtest shows a typical error of ±15.4%, with 100% of held-out values landing inside the 95% band.

-12%Change by 2029
0.34Projected 2029 index
0.00–1.495% range
±15.4%Backtest error
19672029
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
20250.370.001.4
20260.360.001.4
20270.350.001.4
20280.340.001.4
20290.340.001.4

Routes In Shortgrass Prairie

Routes recording Brewer's Sparrow in Shortgrass Prairie.
RockportCOLORADO152024
NunnCOLORADO122021
EdisonCOLORADO102018
ChugwaterWYOMING72024
CrowleyCOLORADO61994
BoyeroCOLORADO52017
KarvalCOLORADO52017
Doyle Bridge 2COLORADO52021
Pine BluffWYOMING52021
KirkCOLORADO42023
NeegrandeCOLORADO42024
PlainsTEXAS41998
CheyenneWYOMING42024
AbarrCOLORADO31998
Last ChanceCOLORADO22015
RushCOLORADO22022
Mica ButteCOLORADO21979
Two ButtesCOLORADO22011
Cone MtnCOLORADO22022
LimonCOLORADO22011
DaltonNEBRASKA21969
KimballNEBRASKA22004
Murray LakeNEBRASKA22011
GrenvilleNEW-MEXICO22010
MaxwellNEW-MEXICO22015

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