Sure, Jo...Good question.
Go to:
http://ebird.org/ebird/hotspot/L2733921?yr=all&m=&rank=mrec
Here, from a May 23rd sighting, you can see Jan Seiler's comment about her Kirtland's Warbler observation:
On a Wisconsin Natural Resources trip, two (male and female) Kirtland's were seen by a group of 10 participants. Male was singing from top of dead tree, female appeared briefly close-by.
Here sighting along with other recent ones in Wisconsin mean this rare species has now nested in the state for seven or eight consecutive nesting seasons since the mid-2000s when they were initially confirmed as nesters.