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

Field Sparrow In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionGeneralists

Field Sparrow in Boreal Hardwood Transition has fallen sharply: down 64% on the route-weighted index since 1968.

-64%Since 1968
83Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Field Sparrow has fallen sharply in Boreal Hardwood Transition: down 64% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Field Sparrow in Boreal Hardwood Transition is projected to fall about 91% by 2029 — from 0.64 in 2024 to a central estimate of 0.06 (95% range 0.00–0.61). A 5-year backtest shows a typical error of ±61.6%, with 80% of held-out values landing inside the 95% band.

-91%Change by 2029
0.06Projected 2029 index
0.00–0.6195% range
±61.6%Backtest error
19662029
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
20250.150.000.70
20260.120.000.68
20270.100.000.66
20280.080.000.63
20290.060.000.61

Routes In Boreal Hardwood Transition

Routes recording Field Sparrow in Boreal Hardwood Transition.
Union TwpWISCONSIN152024
HarriettaMICHIGAN92024
Sand LakeMICHIGAN82024
Hubbard LakeMICHIGAN71988
Bear LakeMICHIGAN62024
Red OakMICHIGAN52022
Gibbs CityMICHIGAN41993
Lake CityMICHIGAN42022
IronsMICHIGAN41989
Brush CreekMICHIGAN32016
SkeelsMICHIGAN32008
FredericMICHIGAN31997
WausaukeeWISCONSIN32024
CathroMICHIGAN22015
Pleasant Valley 2MICHIGAN22024
FloodwoodMINNESOTA21981
BemidjiMINNESOTA21979
DebsMINNESOTA22008
BayfieldWISCONSIN22009
ExelandWISCONSIN22008
McnaughtonWISCONSIN22024
Eagle RiverWISCONSIN21986
OntonagonMICHIGAN12015
MareniscoMICHIGAN12005
Crystal FlsMICHIGAN11992

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