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

Gray Partridge In Northern Rockies

All regionsNorthern RockiesGeneralists

Gray Partridge in Northern Rockies has risen sharply: up 59% on the route-weighted index since 1973.

+59%Since 1973
25Routes In Region
46Years

Notable Signals

long arc increasecomputed index

Gray Partridge has risen sharply in Northern Rockies: up 59% on the route-weighted index since 1973.

Forecast

If the recent trend holds, Gray Partridge in Northern Rockies is projected to fall about 72% by 2029 — from 0.23 in 2024 to a central estimate of 0.07 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±86.7%, with 60% of held-out values landing inside the 95% band.

-72%Change by 2029
0.07Projected 2029 index
0.00–0.1795% range
±86.7%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
20250.070.000.17
20260.070.000.17
20270.070.000.17
20280.070.000.17
20290.070.000.17

Routes In Northern Rockies

Routes recording Gray Partridge in Northern Rockies.
Clyde ParkMONTANA122024
WorlandWYOMING92024
PolsonMONTANA62024
Pablo Res.MONTANA52005
LaurelMONTANA32019
Crane CreekIDAHO22010
AugustaMONTANA21989
BoulderMONTANA22024
Willow CreekMONTANA21976
Wise RiverMONTANA22000
GlenMONTANA22021
Willow Creek 2MONTANA22024
Church HillMONTANA22024
Threemile WaMONTANA22021
CodyWYOMING22013
NowoodWYOMING22009
ClarkWYOMING21991
LeoWYOMING22016
KalispellMONTANA12009
St MaryMONTANA12007
ChestnutMONTANA12015
Wolf CreekMONTANA12018
WickiupOREGON11970
CloverlandWASHINGTON12014
LamontWYOMING12000

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