At a quick glance it is easy to dismiss these beautiful birds for yet another white-throated sparrow so keep your eyes open. They often hang out in flocks with white-throats sparrows so you need to look carefully.
White-crowned sparrows are found in the from mid-Iowa south in the winter and in some places out west year-round but are only in Minnesota during migration. They will soon leave for the very northernmost parts of Canada to breed. Get out there and enjoy them while you can.