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

Marsh Wren In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Marsh Wren in Boreal Hardwood Transition has surged: up 206% on the route-weighted index since 1970.

+206%Since 1970
37Routes In Region
52Years

Notable Signals

long arc increasecomputed index

Marsh Wren has surged in Boreal Hardwood Transition: up 206% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Marsh Wren in Boreal Hardwood Transition is projected to rise about 39% by 2029 — from 0.16 in 2024 to a central estimate of 0.22 (95% range 0.00–0.61). A 5-year backtest shows a typical error of ±64.1%, with 100% of held-out values landing inside the 95% band.

+39%Change by 2029
0.22Projected 2029 index
0.00–0.6195% range
±64.1%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
20250.220.000.61
20260.220.000.61
20270.220.000.61
20280.220.000.61
20290.220.000.61

Routes In Boreal Hardwood Transition

Routes recording Marsh Wren in Boreal Hardwood Transition.
Little ForkMINNESOTA121990
CohassetMINNESOTA111990
BackusMINNESOTA52024
Iron RiverWISCONSIN52024
BayfieldWISCONSIN51982
DebsMINNESOTA22023
BrainerdMINNESOTA22023
GreenbushMINNESOTA22023
MareniscoMICHIGAN12015
Brocky LakeMICHIGAN12013
GilchristMICHIGAN11995
Skegemog PtMICHIGAN12011
Seney NwrMICHIGAN11996
Wigwam BayMINNESOTA12018
Mille LacsMINNESOTA12016
Pine RiverMINNESOTA12024
HovlandMINNESOTA11983
Sherry LakeMINNESOTA11987
BemidjiMINNESOTA11968
WaskishMINNESOTA12008
MahtowaMINNESOTA12015
McgregorMINNESOTA12008
BlackduckMINNESOTA12019
GlendaleMINNESOTA12016
Red LakeMINNESOTA12022

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