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

Kirtland's Warbler In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Kirtland's Warbler in Boreal Hardwood Transition has surged: up 169% on the route-weighted index since 2000.

+169%Since 2000
11Routes In Region
26Years

Notable Signals

long arc increasecomputed index

Kirtland's Warbler has surged in Boreal Hardwood Transition: up 169% on the route-weighted index since 2000.

Forecast

If the recent trend holds, Kirtland's Warbler in Boreal Hardwood Transition is projected to stay roughly flat through 2029, near 0.10 (95% range 0.04–0.15). A 5-year backtest shows a typical error of ±55.7%, with 100% of held-out values landing inside the 95% band.

+5%Change by 2029
0.10Projected 2029 index
0.04–0.1595% range
±55.7%Backtest error
19862029
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
20250.090.040.14
20260.090.040.15
20270.090.040.15
20280.100.040.15
20290.100.040.15

Routes In Boreal Hardwood Transition

Routes recording Kirtland's Warbler in Boreal Hardwood Transition.
Sand LakeMICHIGAN72024
Red OakMICHIGAN52022
SkeelsMICHIGAN32011
AmbergWISCONSIN22012
IshpemingMICHIGAN12010
Skegemog PtMICHIGAN12013
MayfieldMICHIGAN12014
Hiawatha NfMICHIGAN12013
Betchler LksMICHIGAN12016
Scott'S MarshMICHIGAN12008
Big Island LakeMICHIGAN12009

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