Why does fruit fall off a peach tree before the fruit is ripe?

peach trees need a lot of chemicals to produce. Call the county extension service in your area and they will be able to teat your soul and tell you what you need.

For the correct answer. https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-fruit-drop.htm

Peaches that fall from the tree when they are about 1 inch in diameter may be due to the trees' natural thinning. Early in the season you may need to help the tree thin the fruit so the remaining peaches can grow bigger and sweeter.

Peach trees do not need a lot of chemicals to produce. They will naturally thin out early in the season and later you may have to take a lot of them off the branches that are drooping way too much from the weight. They should be about ping pong ball size then. I keep that group we have thinned in a box and watch them for rotting. They will eventually ripen too and I make them into peach butter, using them with the skins on. Then the peaches that are left will ripen on time and be bigger for it. I got about 4 bushels off my Elberta tree this year all total including the ones for peach butter. The ones that we picked after they began to ripen were beautiful and probably the size of a baseball. They were not damaged except for where a bird might have pecked a few...and no worms. We use no chemicals and are healthier for it. The worst thing for a peach tree is to leave the ones that fall on the ground to rot, where they can get pests and diseases that could eventually harm the tree. We are on the NY/PA border, zone 5b. Maybe it is different in the south. Also, our tree does not produce every year so I make sure I "can" plenty of peaches for the "lean times".

Janet, thank you for the article 🤗