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

Cape May Warbler In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Cape May Warbler in Boreal Hardwood Transition has surged: up 14× on the route-weighted index since 1970.

14×Since 1970
77Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Cape May Warbler has surged in Boreal Hardwood Transition: up 14× on the route-weighted index since 1970.

Forecast

If the recent trend holds, Cape May Warbler in Boreal Hardwood Transition is projected to rise about 26% by 2029 — from 0.39 in 2024 to a central estimate of 0.49 (95% range 0.15–0.82). A 5-year backtest shows a typical error of ±33.2%, with 80% of held-out values landing inside the 95% band.

+26%Change by 2029
0.49Projected 2029 index
0.15–0.8295% range
±33.2%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
20250.460.130.79
20260.470.130.80
20270.470.140.81
20280.480.150.81
20290.490.150.82

Routes In Boreal Hardwood Transition

Routes recording Cape May Warbler in Boreal Hardwood Transition.
Sawbill CampMINNESOTA102024
LockportMINNESOTA62024
Eagle RiverWISCONSIN62022
Imp LakeMICHIGAN52016
JordanMINNESOTA52023
HermanMICHIGAN42022
IshpemingMICHIGAN42021
CathroMICHIGAN41995
Sherry LakeMINNESOTA42022
BabbittMINNESOTA42017
ShanagoldenWISCONSIN42022
Land O LakesWISCONSIN42016
CohassetMINNESOTA32013
GlendaleMINNESOTA32022
Popple RiverWISCONSIN32024
OntonagonMICHIGAN22018
BerglandMICHIGAN22022
CunardMICHIGAN21994
ShingletonMICHIGAN22023
Isabella 2MICHIGAN22019
MayfieldMICHIGAN22005
Seney NwrMICHIGAN22014
Hart LakeMINNESOTA22024
DebsMINNESOTA22024
Crane LakeMINNESOTA22023

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