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

Tree Swallow In Northern Rockies

All regionsNorthern RockiesAerial insectivores

Tree Swallow in Northern Rockies has increased: up 32% on the route-weighted index since 1970.

+32%Since 1970
183Routes In Region
56Years

Notable Signals

No notable trend signals for Tree Swallow in Northern Rockies. See the full index history below.

Forecast

If the recent trend holds, Tree Swallow in Northern Rockies is projected to stay roughly flat through 2029, near 5.8 (95% range 3.3–8.3). A 5-year backtest shows a typical error of ±9.9%, with 100% of held-out values landing inside the 95% band.

+9%Change by 2029
5.8Projected 2029 index
3.3–8.395% range
±9.9%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
20255.73.38.2
20265.83.38.2
20275.83.38.2
20285.83.38.3
20295.83.38.3

Routes In Northern Rockies

Routes recording Tree Swallow in Northern Rockies.
Red RockMONTANA1152024
CascadeIDAHO711984
Green RiverWYOMING671984
Pablo Res.MONTANA392024
Hebgen LakeMONTANA372024
CodyWYOMING322024
ChestnutMONTANA272024
CabartonIDAHO262023
Clyde ParkMONTANA242024
BeaverheadMONTANA212024
MeeteetseWYOMING202024
KalispellMONTANA192024
St. Mary 2MONTANA192024
SeedskadeeWYOMING192023
BoulderWYOMING182024
Seedskadee 2WYOMING182024
NezperceIDAHO162007
Hayden ValWYOMING161986
CentervilleIDAHO152019
WoodmanMONTANA152024
EllistonMONTANA152024
Logan PassMONTANA142024
SaveryWYOMING141995
MammothWYOMING142024
NinemileMONTANA132024

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