BirdAnalyst
Species · BCR 11 · BBS 2025 Release · 1966–2024

Brewer's Sparrow In Prairie Potholes

All regionsPrairie PotholesGeneralists

Brewer's Sparrow in Prairie Potholes has surged: up 103% on the route-weighted index since 1972.

+103%Since 1972
19Routes In Region
51Years

Notable Signals

long arc increasecomputed index

Brewer's Sparrow has surged in Prairie Potholes: up 103% on the route-weighted index since 1972.

Forecast

If the recent trend holds, Brewer's Sparrow in Prairie Potholes is projected to rise about 22% by 2029 — from 0.31 in 2024 to a central estimate of 0.38 (95% range 0.04–0.72). A 5-year backtest shows a typical error of ±22.7%, with 100% of held-out values landing inside the 95% band.

+22%Change by 2029
0.38Projected 2029 index
0.04–0.7295% range
±22.7%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
20250.360.020.70
20260.370.020.71
20270.370.030.71
20280.370.030.72
20290.380.040.72

Routes In Prairie Potholes

Routes recording Brewer's Sparrow in Prairie Potholes.
ClevelandMONTANA122024
HarlemMONTANA82021
ShelbyMONTANA62022
MaltaMONTANA52024
OswegoMONTANA42001
Ester LakeMONTANA42023
VirgelleMONTANA22024
GildfordMONTANA22016
ChinookMONTANA22024
LambertMONTANA22022
Hay LakeMONTANA12021
SunburstMONTANA12003
GlasgowMONTANA12021
RedstoneMONTANA12022
Great FallsMONTANA11988
WhitlashMONTANA12024
SacoMONTANA12019
GlentanaMONTANA12015
Wolf PointMONTANA12018

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