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

Swainson's Hawk In Northern Rockies

All regionsNorthern RockiesGeneralists

Swainson's Hawk in Northern Rockies has surged: up 424% on the route-weighted index since 1971.

+424%Since 1971
116Routes In Region
55Years

Notable Signals

long arc increasecomputed index

Swainson's Hawk has surged in Northern Rockies: up 424% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Swainson's Hawk in Northern Rockies is projected to rise about 13% by 2029 — from 0.33 in 2024 to a central estimate of 0.38 (95% range 0.18–0.57). A 5-year backtest shows a typical error of ±18.7%, with 80% of held-out values landing inside the 95% band.

+13%Change by 2029
0.38Projected 2029 index
0.18–0.5795% range
±18.7%Backtest error
19692029
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
20250.360.160.56
20260.360.170.56
20270.370.170.57
20280.370.170.57
20290.380.180.57

Routes In Northern Rockies

Routes recording Swainson's Hawk in Northern Rockies.
HarmonyWYOMING82023
RandolphUTAH62024
Church HillMONTANA52024
BridgeportOREGON52021
Elk HornWYOMING52018
St. Mary 2MONTANA42023
SeedskadeeWYOMING42016
Crane CreekIDAHO32019
Sawtooth City 2IDAHO32023
Red RockMONTANA32023
EtheteWYOMING32023
Mtn ViewWYOMING31980
Great DivideCOLORADO22024
CascadeIDAHO21982
BoulderMONTANA22024
LaurelMONTANA22017
BeaverheadMONTANA22024
Heart ButteMONTANA22021
RaynesfordMONTANA22024
Hebgen LakeMONTANA22024
Fort LoganMONTANA22024
Malheur Res.OREGON22022
E. Bear LakeUTAH22021
MidvaleWYOMING22024
CumberlandWYOMING21980

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