BirdAnalyst
Species · BCR 12 · BBS 2025 Release · 1966–2024

Connecticut Warbler In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Connecticut Warbler in Boreal Hardwood Transition has edged down: down 25% on the route-weighted index since 1969.

-25%Since 1969
68Routes In Region
57Years

Notable Signals

No notable trend signals for Connecticut Warbler in Boreal Hardwood Transition. See the full index history below.

Forecast

If the recent trend holds, Connecticut Warbler in Boreal Hardwood Transition is projected to rise about 217% by 2029 — from 0.05 in 2024 to a central estimate of 0.17 (95% range 0.00–0.53). A 5-year backtest shows a typical error of ±254.4%, with 100% of held-out values landing inside the 95% band.

+217%Change by 2029
0.17Projected 2029 index
0.00–0.5395% range
±254.4%Backtest error
19672029
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
20250.190.000.55
20260.180.000.54
20270.180.000.54
20280.170.000.53
20290.170.000.53

Routes In Boreal Hardwood Transition

Routes recording Connecticut Warbler in Boreal Hardwood Transition.
IsabellaMICHIGAN41989
WaskishMINNESOTA42019
Red LakeMINNESOTA42024
MontrealWISCONSIN31980
Gibbs CityMICHIGAN21985
CunardMICHIGAN22018
TahquamenonMICHIGAN21988
Skegemog PtMICHIGAN22000
FredericMICHIGAN21981
Mille LacsMINNESOTA21996
FloodwoodMINNESOTA22012
Crane LakeMINNESOTA22003
BlackduckMINNESOTA22004
GreenbushMINNESOTA22016
BayfieldWISCONSIN21983
ShanagoldenWISCONSIN21986
Popple RiverWISCONSIN21984
RhinelanderWISCONSIN21998
BerglandMICHIGAN11982
HermanMICHIGAN11984
Crystal FlsMICHIGAN11990
Maple GroveMICHIGAN12004
IshpemingMICHIGAN12021
ShingletonMICHIGAN11981
MuskallongeMICHIGAN12022

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