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

Purple Martin In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionAerial insectivores

Purple Martin in Prairie Hardwood Transition has fallen sharply: down 72% on the route-weighted index since 1968.

-72%Since 1968
143Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Purple Martin has fallen sharply in Prairie Hardwood Transition: down 72% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Purple Martin in Prairie Hardwood Transition is projected to fall about 100% by 2029 — from 2.9 in 2024 to a central estimate of 0.00 (95% range 0.00–2.9). A 5-year backtest shows a typical error of ±155.4%, with 40% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–2.995% range
±155.4%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
20250.000.002.9
20260.000.002.9
20270.000.002.9
20280.000.002.9
20290.000.002.9

Routes In Prairie Hardwood Transition

Routes recording Purple Martin in Prairie Hardwood Transition.
MiddleburyINDIANA612024
PackertownINDIANA362004
EdwardsMINNESOTA362024
LagrangeINDIANA272024
KielWISCONSIN262022
GraytownOHIO241984
PardeevilleWISCONSIN212024
HollandWISCONSIN202024
Packertown 2INDIANA162024
HoltMICHIGAN162024
NapoleonOHIO162024
MottvilleMICHIGAN122018
Whitewater 2MINNESOTA112019
LimestoneOHIO112023
ClintonvilleWISCONSIN112008
ManitowocWISCONSIN92024
Columbia CtyINDIANA82022
PrattvilleMICHIGAN72021
PettysvilleMICHIGAN71979
Chippewa Lk.MICHIGAN72024
OmroWISCONSIN72001
LakevilleINDIANA62024
HartlandMICHIGAN62001
St StephenMINNESOTA62016
New LondonMINNESOTA62024

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