Based on 1,856 research-grade iNaturalist observations in Wisconsin, Tree Swallow is most often recorded in May; in Wisconsin it behaves like a seasonal. It ranks #31 among birds recorded in the state in our data.
Tachycineta bicolor
Tree Swallow in Wisconsin by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in Wisconsin in May
Red-winged Blackbird
American Robin
Baltimore Oriole
Canada Goose
Mallard
Rose-breasted Grosbeak
Gray Catbird
Sandhill Crane
Places to look in Wisconsin
State ParkAztalan State Park
State ParkWyalusing State Park
National ForestChequamegon–Nicolet National Forest
State ParkMerrick State Park
State ParkPerrot State Park
State ParkLake Kegonsa State Park
FAQ
When does Tree Swallow appear in Wisconsin?
Mainly April–June, with the most records in May.
How common is Tree Swallow in Wisconsin?
It ranks #31 by number of iNaturalist observations among birds in Wisconsin (1,856 records in our sample).