Based on 1,726 research-grade iNaturalist flowering observations in Wisconsin, Large White Trillium blooms mainly from May to May, peaking in May. It ranks #1 among wildflowers recorded in the state in our data.
Trillium grandiflorum
Large White Trillium 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 in bloom in Wisconsin in May
Red Columbine
Wild Geranium
Wood Anemone
Jack-in-the-Pulpit
Marsh Marigold
Northern Starflower
Dutchman's breeches
Bloodroot
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 Large White Trillium bloom in Wisconsin?
Mainly May–May, with the most records in May.
How common is Large White Trillium in Wisconsin?
It ranks #1 by number of iNaturalist flowering observations among wildflowers in Wisconsin (1,726 records in our sample).