BirdAnalyst
Species · BCR 23 · BBS 2025 Release · 1966–2024

Henslow's Sparrow In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionGrassland birds

Henslow's Sparrow in Prairie Hardwood Transition has collapsed: down 92% on the route-weighted index since 1968.

-92%Since 1968
97Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Henslow's Sparrow has collapsed in Prairie Hardwood Transition: down 92% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Henslow's Sparrow in Prairie Hardwood Transition is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±369%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.00Projected 2029 index
0.00–0.2495% range
±369%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
20250.000.000.24
20260.000.000.24
20270.000.000.24
20280.000.000.24
20290.000.000.24

Routes In Prairie Hardwood Transition

Routes recording Henslow's Sparrow in Prairie Hardwood Transition.
TrempealeauWISCONSIN181984
HoltMICHIGAN91972
JuniataMICHIGAN71979
PackertownINDIANA41970
HighlandWISCONSIN42012
DeckervilleMICHIGAN32001
Money CreekMINNESOTA32003
GilmantonWISCONSIN32019
Buena VistaWISCONSIN32022
LawrenceMICHIGAN21979
BravoMICHIGAN21985
GalesburgMICHIGAN22011
New BuffaloMICHIGAN22013
CaledoniaMINNESOTA22007
New LondonMINNESOTA22006
GlenwoodMINNESOTA22014
Sherburne NrMINNESOTA22013
UnityWISCONSIN21976
ClintonvilleWISCONSIN21983
PardeevilleWISCONSIN22005
Fall RiverWISCONSIN22018
WiotaWISCONSIN22002
Mount HorebWISCONSIN21982
HebronWISCONSIN21986
StetsonvilleWISCONSIN21994

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