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

Barn Swallow In Northern Rockies

All regionsNorthern RockiesAerial insectivores

Barn Swallow in Northern Rockies has fallen sharply: down 51% on the route-weighted index since 1970.

-51%Since 1970
183Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Barn Swallow has fallen sharply in Northern Rockies: down 51% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Barn Swallow in Northern Rockies is projected to fall about 67% by 2029 — from 2.3 in 2024 to a central estimate of 0.76 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±42%, with 100% of held-out values landing inside the 95% band.

-67%Change by 2029
0.76Projected 2029 index
0.00–3.595% range
±42%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
20251.20.003.9
20261.10.003.8
20270.980.003.7
20280.870.003.6
20290.760.003.5

Routes In Northern Rockies

Routes recording Barn Swallow in Northern Rockies.
BasinWYOMING502024
Browns ParkCOLORADO362007
Rock RiverWYOMING352022
CascadeIDAHO291984
MidvaleWYOMING292024
OttoWYOMING282024
RandolphUTAH182024
SpartaOREGON172001
Gas Hills 2WYOMING172024
MadrasOREGON122024
EtheteWYOMING122024
ChestnutMONTANA102018
Elk HornWYOMING102018
Bear CreekWYOMING102015
Pablo Res.MONTANA92024
Wolf CreekMONTANA92022
GeboWYOMING92024
Twin BridgesMONTANA81976
Wise RiverMONTANA82022
St. Mary 2MONTANA82023
Mount VernonOREGON82024
FrannieWYOMING82024
MeeteetseWYOMING82024
MaybellCOLORADO72024
NaplesIDAHO72024

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