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

Warbling Vireo In Great Basin

All regionsGreat BasinForest birds

Warbling Vireo in Great Basin has surged: up 221% on the route-weighted index since 1970.

+221%Since 1970
149Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Warbling Vireo has surged in Great Basin: up 221% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Warbling Vireo in Great Basin is projected to rise about 17% by 2029 — from 4.1 in 2024 to a central estimate of 4.8 (95% range 3.7–5.8). A 5-year backtest shows a typical error of ±14.8%, with 80% of held-out values landing inside the 95% band.

+17%Change by 2029
4.8Projected 2029 index
3.7–5.895% range
±14.8%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
20254.53.45.6
20264.63.55.6
20274.63.55.7
20284.73.65.8
20294.83.75.8

Routes In Great Basin

Routes recording Warbling Vireo in Great Basin.
Blewett PassWASHINGTON562024
AustinNEVADA372018
Picture FlatOREGON372024
LakeviewOREGON372024
NewhalemWASHINGTON372024
KendallWASHINGTON342024
SquirrelIDAHO292024
RimrockWASHINGTON272024
E. Mt. AdamsWASHINGTON262024
Hardware RanchUTAH242023
Oak CityUTAH212024
L. WenatcheeWASHINGTON212024
Magic MtnIDAHO192024
Mt HoodOREGON182024
RonaldWASHINGTON182024
Silver CityIDAHO172024
White ChuckWASHINGTON152024
MazamaWASHINGTON152022
BartleCALIFORNIA132021
SnowdenWASHINGTON132024
No CascadesWASHINGTON132019
MacdoelCALIFORNIA122019
ConcreteWASHINGTON122024
Lake ChelanWASHINGTON122024
LeadoreIDAHO112024

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