are peaches on the tree safe in a 28 degree night?

Question

Peaches are small and not fully ripened.

Answer 1

No, they should be ripe by now. They will probably drop soon.

These articles will help you to know when to harvest peaches: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-harvesting.htm

This will help you to get peaches to form properly: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-care.htm

This will help with fertilization: https://www.gardeningknowhow.com/edible/fruits/peach/fertilizing-peach-trees.htm