I have two different peach trees in my yard. Last fall we trimmed them. One has a lot of leaves but no peaches, and on the other one the leaves are few and far between. We had a very harsh winter in Chicago. Could that have something to do with it? Both trees are in full sunlight all day.
Yes, the hard winter has affected trees and plants around the country. Another cause might be age -- peach trees need a few years to really get going. Here are a couple of articles that may suggest avenues of investigation you can use to understand the problems: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-not-leafing-out.htm