BirdAnalyst
Species · Wisconsin · BBS 2025 Release · 1966–2024

Purple Martin Population Trend in Wisconsin

All statesAerial insectivores

Purple Martin in Wisconsin has collapsed: down 89% on the route-weighted index since 1968.

-89%Since 1968
84Routes In State
58Years

Notable Purple Martin Trends in Wisconsin

long arc declinecomputed index

Purple Martin has collapsed in Wisconsin: down 89% on the route-weighted index since 1968.

Purple Martin Population Forecast in Wisconsin

If the recent trend holds, Purple Martin in Wisconsin is projected to fall about 100% by 2029 — from 1.1 in 2024 to a central estimate of 0.00 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±371%, with 20% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–2.795% range
±371%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
20250.000.002.7
20260.000.002.7
20270.000.002.7
20280.000.002.7
20290.000.002.7

Purple Martin Survey Routes in Wisconsin

Routes recording Purple Martin in Wisconsin.
Kiel2620222005
Pardeeville2120241967
Holland2020241999
Clintonville1120081972
Manitowoc920241966
Exeland719921968
Omro720011966
Newburg Crns620241967
N Freedom620241967
Omro 2620242002
Casco520241966
Rib Lake419891966
Cadott420241966
Brownsville420211966
Bayfield319931969
Hudson320231967
Loraine320211966
Popple River319941967
Hollister320021967
Gilmanton320241967
Stevens Pt320001967
Pt Washingtn320241966
Montreal219881975
Weyerhauser220231966
Couderay220081969

Purple Martin Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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