BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Blue Grosbeak In Northern Rockies

All regionsNorthern RockiesGeneralists

Blue Grosbeak in Northern Rockies has surged: up 333% on the route-weighted index since 1992.

+333%Since 1992
11Routes In Region
19Years

Notable Signals

long arc increasecomputed index

Blue Grosbeak has surged in Northern Rockies: up 333% on the route-weighted index since 1992.

Forecast

If the recent trend holds, Blue Grosbeak in Northern Rockies is projected to fall about 30% by 2029 — from 0.06 in 2024 to a central estimate of 0.04 (95% range 0.01–0.07). A 5-year backtest shows a typical error of ±70.6%, with 20% of held-out values landing inside the 95% band.

-30%Change by 2029
0.04Projected 2029 index
0.01–0.0795% range
±70.6%Backtest error
19872029
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
20250.040.010.06
20260.040.010.07
20270.040.010.07
20280.040.010.07
20290.040.010.07

Routes In Northern Rockies

Routes recording Blue Grosbeak in Northern Rockies.
OttoWYOMING52024
MidvaleWYOMING32017
EtheteWYOMING22023
GeboWYOMING22015
MaybellCOLORADO12017
Browns ParkCOLORADO12024
LayCOLORADO12022
LaurelMONTANA12022
BasinWYOMING12024
TensleepWYOMING12024
Mtn ViewWYOMING12023

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