BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Tree Swallow In Great Basin

All regionsGreat BasinAerial insectivores

Tree Swallow in Great Basin has increased: up 45% on the route-weighted index since 1970.

+45%Since 1970
167Routes In Region
56Years

Notable Signals

No notable trend signals for Tree Swallow in Great Basin. See the full index history below.

Forecast

If the recent trend holds, Tree Swallow in Great Basin is projected to rise about 16% by 2029 — from 2.1 in 2024 to a central estimate of 2.4 (95% range 0.98–3.8). A 5-year backtest shows a typical error of ±60.3%, with 80% of held-out values landing inside the 95% band.

+16%Change by 2029
2.4Projected 2029 index
0.98–3.895% range
±60.3%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
20252.40.963.8
20262.40.963.8
20272.40.973.8
20282.40.973.8
20292.40.983.8

Routes In Great Basin

Routes recording Tree Swallow in Great Basin.
HenryIDAHO931983
FallonNEVADA821998
Modoc Point 2OREGON792024
Modoc PointOREGON552018
TwispWASHINGTON302024
DeschutesOREGON262024
HarringtonWASHINGTON252012
NighthawkWASHINGTON232024
Dinner StaNEVADA201968
Ruby ValleyNEVADA192000
Barnes ValOREGON191987
Daniels ResIDAHO152007
OrdnanceOREGON141979
WapatoWASHINGTON132019
Magic MtnIDAHO122024
Mt HoodOREGON112024
AdrianOREGON111993
WilburWASHINGTON102024
HackamoreCALIFORNIA92010
LeavenworthWASHINGTON92024
MacdoelCALIFORNIA82019
Iron GateCALIFORNIA82019
Oak CityUTAH82016
Hardware RanchUTAH82016
L. WenatcheeWASHINGTON82024

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